Document and Entity Information Statement [Table] Statement [Line Items] Statement Entity Registrant Name Entity Central Index Key Document Type Document Period End Date Amendment Flag Current Fiscal Year End Date Entity Well-known Seasoned Issuer Entity Voluntary Filers Entity Current Reporting Status Entity Filer Category Entity Public Float Entity Common Stock, Shares Outstanding Document Fiscal Year Focus Document Fiscal Period Focus CONSOLIDATED BALANCE SHEETS Assets [Abstract] Assets Assets, Current [Abstract] Current assets: Cash and Cash Equivalents, at Carrying Value Cash and cash equivalents at end of period Cash and cash equivalents at beginning of period Cash and cash equivalents Accounts Receivable, Net, Current Accounts receivable, net of allowance of $84 and $107 as of December 31, 2014 and 2013 Inventory, Net Supplies inventory Prepaid Expense and Other Assets, Current Prepaid expenses and other current assets Deferred Tax Assets, Net, Current Deferred tax asset Restricted Cash and Cash Equivalents, Current Restricted cash Cash reserved to cover liabilities associated with Merger Assets, Current Total current assets Property, Plant and Equipment, Net Property and equipment, net Total property and equipment, net Net book value Carrying amount (original costs adjusted for previously recognized amortization and impairment) as of the balance sheet date for acquired in-process research and development. Indefinite Lived In Process Research And Development In-process research and development Goodwill Restricted Cash and Cash Equivalents, Noncurrent Restricted cash Long term deposit consisting of letter of credit serving as security for lease Other Assets, Noncurrent Other assets Assets Total assets Liabilities and Equity [Abstract] Liabilities and Stockholders' Equity Liabilities, Current [Abstract] Current liabilities: Accounts Payable, Current Accounts payable Outstanding obligations Accrued Liabilities, Current Accrued liabilities Total accrued liabilities Deferred Revenue, Current Deferred Genzyme co-promotion fee Liabilities, Current Total current liabilities Long-term Debt, Excluding Current Maturities Long-term debt, net of current portion Long-term debt Deferred Tax Liabilities, Net, Noncurrent Deferred tax liability Deferred Rent Credit, Noncurrent Deferred rent, net of current portion Deferred Revenue, Noncurrent Deferred Genzyme co-promotion fee, net of current portion Liabilities Total liabilities Commitments and Contingencies. Commitments and contingencies (Note 7) Stockholders' Equity Attributable to Parent [Abstract] Stockholders' equity: Preferred Stock, Value, Issued. Preferred stock, $0.001 par value; 5,000,000 shares authorized, 0 shares issued and outstanding as of December 31, 2014 and 2013 Common Stock, Value, Issued Common stock, $0.001 par value; 125,000,000 shares authorized, 22,523,529 and 21,143,313 shares issued and outstanding as of December 31, 2014 and 2013 Additional Paid in Capital, Common Stock Additional paid-in capital Retained Earnings (Accumulated Deficit) Accumulated deficit Stockholders' Equity Attributable to Parent Balance Balance Total stockholders' equity Liabilities and Equity Total liabilities and stockholders' equity Allowance for Doubtful Accounts Receivable, Current Ending balance Beginning balance Accounts receivable, allowance (in dollars) Preferred Stock, Par or Stated Value Per Share Preferred stock, par value (in dollars per share) Preferred Stock, Shares Authorized Preferred stock, shares authorized Preferred Stock, Shares Issued Preferred stock, shares issued Preferred Stock, Shares Outstanding Preferred stock, shares outstanding Common Stock, Par or Stated Value Per Share Common stock, par value (in dollars per share) Par value of shares of common stock (in dollars per share) Common Stock, Shares Authorized Common stock, shares authorized Authorized shares of common stock Common Stock, Shares, Issued Common stock, shares issued Common Stock, Shares, Outstanding Common stock, shares outstanding CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS Revenue, Net Revenue Total revenues Operating Expenses [Abstract] Operating expenses: Cost of Revenue. Cost of revenue Research and Development Expense Research and development Selling and Marketing Expense Selling and marketing General and Administrative Expense General and administrative Operating Expenses Total operating expenses Operating Income (Loss) Loss from operations Interest Expense Interest expense Other Nonoperating Income (Expense) Other income (expense), net Net Income (Loss) Available to Common Stockholders, Basic Net loss Net loss Comprehensive Income (Loss), Net of Tax, Attributable to Parent Comprehensive loss Comprehensive loss Earnings Per Share, Basic and Diluted Net loss per common share, basic and diluted (in dollars per share) Net loss per common share, basic and diluted Weighted Average Number of Shares Outstanding, Basic and Diluted Shares used to compute net loss per common share, basic and diluted (in shares) CONSOLIDATED STATEMENTS OF CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY (DEFICIT) Class of Stock [Axis] Class Of Stock [Domain] Class of Stock [Domain] Convertible Preferred Stock [Member] Convertible Preferred Stock. Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Common Stock [Member] Common Stock Additional Paid In Capital [Member] Additional Paid-in Capital Retained Earnings [Member] Accumulated Deficit A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. Increase (Decrease) in Convertible Preferred Stock and Stockholders Equity [Roll Forward] Increase (Decrease) in Convertible Preferred Stock and Stockholders' Equity (Deficit) Temporary Equity, Carrying Amount, Attributable to Parent Balance Balance Temporary Equity, Shares Outstanding Balance (in shares) Balance (in shares) Shares, Outstanding Balance (in shares) Balance (in shares) Value of convertible preferred stock issued during the period. Stock Issued During Period Value Convertible Preferred Stock Issuance of convertible preferred stock, net of issuance costs and preferred stock liability Number of convertible preferred shares issued during the period. Stock Issued During Period Shares Convertible Preferred Stock Issuance of convertible preferred stock, net of issuance costs and preferred stock liability (in shares) Represents the amount of extinguishment of the preferred stock liability. Extinguishment of Preferred Stock Liability Extinguishment of the preferred stock liability Stock Issued During Period, Value, Stock Options Exercised Issuance of common stock on exercise of stock options Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Exercised (in shares) Issuance of common stock on exercise of stock options (in shares) Stock Issued During Period, Value, New Issues Issuance of common stock in initial public offering, net of discounts and commissions of $4,642 and issuance costs of $2,507 Stock Issued During Period, Shares, New Issues Number of shares issued and sold in IPO Issuance of common stock in initial public offering, net of discounts and commissions of $4,642 and issuance costs of $2,507 (in shares) Stock Issued During Period, Value, Conversion of Convertible Securities Conversion of preferred stock into common stock upon initial public offering Stock Issued During Period, Shares, Conversion of Convertible Securities Common stock issued on automatic conversion of outstanding convertible preferred stock (in shares) Conversion of preferred stock into common stock upon initial public offering (in shares) Amount of increase in additional paid-in capital (APIC) upon reclassification of preferred stock warrant liability during the period. Adjustments to Additional Paid in Capital on Reclassification of Preferred Stock Warrant Reclassification of preferred stock warrant liability into additional paid-in capital upon initial public offering Value of stock issued as a result of the exercise of warrants. Stock Issued During Period, Value, Warrants Exercised Issuance of common stock on cashless exercise of stock warrant Number of shares of stock issued during the period as a result of the exercise of warrants. Stock Issued During Period Shares Warrants Exercised Issuance of common stock on cashless exercise of warrant (in shares) Represents the amount of increase (decrease) in additional paid-in capital (APIC) due to common stock subject to repurchase. Adjustments to Additional Paid in Capital Common Stock Subject to Repurchase Common stock subject to repurchase Fair value of common stock issued for acquisition Issuance of common stock for acquisition Stock Issued During Period, Shares, Acquisitions Issuance of common stock in the merger acquisition (in shares) Amount of increase in additional paid-in capital (APIC) resulting from employee stock-based compensation expense. Adjustments to Additional Paid in Capital Share Based Compensation Employee Stock-based compensation expense (employee) Amount of increase in additional paid-in capital (APIC) resulting from non-employee stock-based compensation expense. Adjustments to Additional Paid in Capital Share Based Compensation Non Employee Stock-based compensation expense (non-employee) Represents the amount of increase in additional-paid in capital (APIC) resulting from equity-based compensation. Adjustments to Additional Paid in Capital Equity Based Compensation Equity-based compensation Represents information pertaining to the series C convertible preferred stock. Series C Convertible Preferred Stock [Member] Series C Original issue price of a single share of convertible preferred stock of a company. Convertible Preferred Stock Original Issue Price Issuance of convertible preferred stock, issue price (in dollars per share) Direct costs (e.g., legal and accounting fees) associated with issuing convertible preferred stock. Also includes any direct costs associated with stock issues under a shelf registration. Convertible Preferred Stock Issued Issuance Costs Issuance of convertible preferred stock, issuance cost The fair value of preferred stock liability assumed in noncash investing or financing activities. Fair Value of Preferred Stock Liability Preferred stock liability Issuance of convertible preferred stock, preferred stock liability Amount of discount on common shares, or any unamortized balance thereof, shown separately as a deduction from the applicable account(s) as circumstances require and commissions on issuance of stock in initial public offering. Common Stock Discount on Shares and Commissions Issuance of common stock in initial public offering, discounts and commissions Common Stock Issued Issuance Costs Issuance of common stock in initial public offering, issuance cost CONSOLIDATED STATEMENTS OF CASH FLOWS Net Cash Provided by (Used in) Operating Activities, Continuing Operations [Abstract] Operating activities Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to reconcile net loss to net cash used in operating activities: Depreciation, Depletion and Amortization Depreciation and amortization Depreciation and amortization expense Provision for Doubtful Accounts Bad debt expense Charged to expense Recognition of Deferred Revenue Genzyme co-promotion fee amortization Amortization of up-front co-promotion fee The aggregate amount of noncash, equity-based employee remuneration for non-bonus related compensation. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. Share Based Compensation Non Bonus Related Stock-based compensation The aggregate amount of noncash, equity-based employee remuneration for bonus related compensation. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. Share Based Compensation Bonus Related Equity-based compensation Amortization of Financing Costs and Discounts Amortization of debt discount and issuance costs Interest Expense, Debt Interest on debt balloon payment Total Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss) Change in value of preferred stock liability Preferred stock liability valuation decrease recorded in other income (expense), net Fair Value Adjustment of Warrants Amount of change in the fair value reported as an expense in other income (expense), net Change in value of preferred stock warrant liability Increase (Decrease) in Operating Capital [Abstract] Changes in operating assets and liabilities: Increase (Decrease) in Accounts Receivable Accounts receivable Increase (Decrease) in Inventories Supplies inventory Increase (Decrease) in Prepaid Expense and Other Assets Prepaid expenses and current other assets Increase (Decrease) in Other Noncurrent Assets Other assets Increase (Decrease) in Accounts Payable Accounts payable The increase (decrease) during the reporting period in the amount of expenses incurred but not yet paid and deferred rent. Increase (Decrease) in Accrued Liabilities and Deferred Rent Accrued liabilities and deferred rent Increase (Decrease) in Deferred Revenue Deferred Genzyme co-promotion fee Co-promotion fee received from Genzyme Net Cash Provided by (Used in) Operating Activities, Continuing Operations Net cash used in operating activities Net Cash Provided by (Used in) Investing Activities, Continuing Operations [Abstract] Investing activities Payments to Acquire Property, Plant, and Equipment Purchases of property and equipment Payments to Acquire Businesses, Net of Cash Acquired Cash remitted for acquisition, net of cash received Increase (Decrease) in Restricted Cash Change in restricted cash Net Cash Provided by (Used in) Investing Activities, Continuing Operations Net cash used in investing activities Net Cash Provided by (Used in) Financing Activities, Continuing Operations [Abstract] Financing activities Proceeds from Issuance of Long-term Debt Proceeds from the issuance of long-term debt, net of debt issuance costs The cash outflow for the payment of the end-of-term obligation. Payment of End of Term Obligation Payment of end-of-term obligation Proceeds from Issuance of Redeemable Convertible Preferred Stock Proceeds from issuance of redeemable convertible preferred stock, net of issuance costs Proceeds from Issuance Initial Public Offering Proceeds from issuance of common stock in initial public offering, gross Payments of Stock Issuance Costs Commissions and issuance costs relating to the initial public offering Proceeds from Stock Options Exercised Proceeds from the exercise of common stock options Net Cash Provided by (Used in) Financing Activities, Continuing Operations Net cash provided by financing activities Net Cash Provided by (Used in) Continuing Operations Net increase (decrease) in cash and cash equivalents Supplemental Cash Flow Information [Abstract] Supplementary cash flow information of non cash investing and financing activities: Notes Issued Non-cash issuance of long-term debt Notes Reduction Non-cash repayment of long-term debt Capital Expenditures Incurred but Not yet Paid Purchases of property and equipment included in accounts payable and accrued liabilities Fair Value of Assets Acquired Non-cash purchases of property and equipment Represents the amount of preferred stock liability transferred to equity. Transfer of Preferred Stock Liability to Equity Transfer of preferred stock liability to equity Future cash outflow to pay for convertible preferred stock issuance costs. Preferred Stock Issuance Costs Incurred but Not Yet Paid Convertible preferred stock issuance costs included in accounts payable Represents the fair value of preferred stock warrants in noncash investing or financing activities. Fair Value of Preferred Stock Warrants Preferred stock warrants The value of the preferred stock warrant liability converted in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. Conversion of Preferred Stock Warrant Liability Amount Converted Conversion of preferred stock warrant liability to common stock warrants The fair value of stock issued in noncash exercise of common stock warrants. Stock Issued, Exercise of Common Stock Warrants Issuance of common stock from the non-cash exercise of common stock warrants Conversion of Stock, Amount Converted Conversion of convertible preferred stock to common stock Represents the amount of IPO costs included in accounts payable and accrued liabilities. Initial Public Offering Costs Included in Accounts Payable and Accrued Liabilities IPO costs included in accounts payable and accrued liabilities Interest Paid Cash paid for interest on debt Represents the amount of equity based compensation transferred from liabilities to equity. Stock Based Compensation Transfer to Equity Transfer of equity-based compensation from liabilities to equity Organization and Description of Business Business Description and Basis of Presentation [Text Block] Organization and Description of Business Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Summary of Significant Accounting Policies Net Loss Per Common Share Earnings Per Share [Text Block] Net Loss Per Common Share Business Combination Business Combination Disclosure [Text Block] Business Combination Balance Sheet Components Supplemental Balance Sheet Disclosures [Text Block] Balance Sheet Components Fair Value Measurements Fair Value Disclosures [Text Block] Fair Value Measurements Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Commitments and Contingencies Debt Debt Disclosure [Text Block] Debt Convertible Preferred Stock Warrant Disclosure of warrants or rights issued. Warrants and rights outstanding are derivative securities that give the holder the right to purchase securities (usually equity) from the issuer at a specific price within a certain time frame. Warrants and Rights Note Disclosure [Text Block] Convertible Preferred Stock Warrant Convertible Preferred Stock Disclosure of temporary equity. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. Temporary Equity Disclosure [Text Block] Convertible Preferred Stock Stockholders' Equity Stockholders' Equity Note Disclosure [Text Block] Stockholders' Equity Stock Incentive Plans Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Stock Incentive Plans Genzyme Co-promotion Agreement Collaborative Arrangement Disclosure [Text Block] Genzyme Co-promotion Agreement Thyroid Cytopathology Partners. Long-term Contracts or Programs Disclosure [Text Block] Thyroid Cytopathology Partners Income Taxes Income Tax Disclosure [Text Block] Income Taxes 401(k) Plan Pension and Other Postretirement Benefits Disclosure [Text Block] 401(k) Plan Selected Quarterly Financial Data (Unaudited) Quarterly Financial Information [Text Block] Selected Quarterly Financial Data (Unaudited)