Document and Entity Information Entity Registrant Name Entity Central Index Key Document Type Document Period End Date Amendment Flag Amendment Description 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 CONDENSED 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 $112 and $107 as of June 30, 2014 and December 31, 2013 Inventory, Net Supplies inventory Prepaid Expense and Other Assets, Current Prepaid expenses and other current assets Assets, Current Total current assets Restricted Cash and Cash Equivalents, Current Restricted cash Certificate of deposit Deferred Finance Costs, Current, Net Deferred financing costs Property, Plant and Equipment, Net Property and equipment, net Net book value Restricted Cash and Cash Equivalents, Noncurrent Restricted cash as collateral for lease Restricted cash 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 Accrued liabilities Deferred Revenue, Current Deferred Genzyme co-promotion fee Long-term Debt, Current Maturities Net debt obligation included in current liabilities Current portion of long-term debt Liabilities, Current Total current liabilities Derivative Liability, Current Fair value of currently exercisable portion of the warrant Preferred stock liability Aggregate fair value of the warrant for the shares exercisable under the warrant Long-term Debt, Excluding Current Maturities Long-term debt, net of current portion Net debt obligation included in long-term debt 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 5) 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 June 30, 2014 and December 31, 2013, respectively Common Stock, Value, Issued Common stock, $0.001 par value; 125,000,000 shares authorized, 21,446,855 and 21,143,313 shares issued and outstanding as of June 30, 2014 and December 31, 2013, respectively Additional Paid in Capital, Common Stock Additional paid-in capital Retained Earnings (Accumulated Deficit) Accumulated deficit Stockholders' Equity Attributable to Parent Total stockholders' equity Liabilities and Equity Total liabilities and stockholders' equity Temporary Equity, Carrying Amount, Attributable to Parent Convertible preferred stock, $0.001 par value; 0 and 59,147,999 shares authorized, 0 and 53,084,507 shares issued and outstanding as of December 31, 2013 and December 31, 2012; aggregate liquidation value of $0 and $65,835 as of December 31, 2013 and 2012 Allowance for Doubtful Accounts Receivable, Current Ending balance Beginning balance Accounts receivable, allowance (in dollars) 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 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 Temporary Equity, Par or Stated Value Per Share Convertible preferred stock, par value (in dollars per share) Temporary Equity, Shares Authorized Convertible preferred stock, shares authorized Temporary Equity, Shares Issued Convertible preferred stock, shares issued Temporary Equity, Shares Outstanding Convertible preferred stock, shares outstanding Temporary Equity, Liquidation Preference Aggregate liquidation value CONDENSED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS Revenue, Net Revenue 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 and comprehensive loss Earnings Per Share, Basic and Diluted Net loss per common share, basic and diluted (in dollars per share) Weighted Average Number of Shares Outstanding, Basic and Diluted Shares used to compute net loss per common share, basic and diluted (in shares) Shares used to compute net loss per common share, basic and diluted Investment Income, Interest Interest income CONDENSED 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 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 Amortization of Financing Costs and Discounts Amortization of debt discount and issuance costs Interest on debt balloon payment included in net income that resulted in no cash outflows in the period. Noncash Expense Interest On Debt Balloon Payment Interest on debt balloon payment Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss) Change in value of preferred stock liability 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 Fair Value Adjustment of Warrants 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 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 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 Proceeds from Issuance of Redeemable Convertible Preferred Stock Proceeds from issuance of redeemable convertible preferred stock, net of issuance costs The cash outflow for cost incurred directly with the issuance of convertible preferred stock. Payments of Stock Issuance Costs Convertible Preferred Stock Payment of convertible preferred stock issuance costs The cash outflow for cost incurred directly with the issuance of an equity security in initial public offering. Payments of Stock Issuance Costs Initial Public Offering 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 Proceeds from Issuance Initial Public Offering Proceeds from issuance of common stock in initial public offering, gross 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: 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 The fair value of preferred stock liability assumed in noncash investing or financing activities. Fair Value of Preferred Stock Liability Preferred stock liability 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 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 Summary of Significant Accounting Policies Organization, Consolidation, Basis of Presentation, Business Description and Accounting Policies [Text Block] Organization and 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 Accrued Liabilities Accounts Payable and Accrued Liabilities Disclosure [Text Block] Accrued Liabilities 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 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 Cytology Partners Long-term Contracts or Programs Disclosure [Text Block] Thyroid Cytology Partners Income Taxes Income Tax Disclosure [Text Block] Income Taxes Subsequent Events Subsequent Events [Text Block] Subsequent Events Basis of Accounting, Policy [Policy Text Block] Basis of Presentation Use of Estimates, Policy [Policy Text Block] Use of Estimates Disclosure of accounting policy for concentrations of credit risk and other risks and uncertainties. Concentrations of Credit and Other Risks and Uncertainties [Policy Text Block] Concentrations of Credit Risk and Other Risks and Uncertainties Cash and Cash Equivalents, Unrestricted Cash and Cash Equivalents, Policy [Policy Text Block] Cash and Cash Equivalents Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, Policy [Policy Text Block] Restricted Cash Receivables, Trade and Other Accounts Receivable, Allowance for Doubtful Accounts, Policy [Policy Text Block] Allowance for Doubtful Accounts Inventory Supplies, Policy [Policy Text Block] Supplies Inventory Property, Plant and Equipment, Policy [Policy Text Block] Property and Equipment Internal Use Software, Policy [Policy Text Block] Internal-use Software Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block] Long-lived Assets Compensation Related Costs, Policy [Policy Text Block] Bonus Accruals Fair Value of Financial Instruments, Policy [Policy Text Block] Fair Value of Financial Instruments Revenue Recognition, Policy [Policy Text Block] Revenue Recognition Cost of Sales, Policy [Policy Text Block] Cost of Revenue Research and Development Expense, Policy [Policy Text Block] Research and Development Income Tax, Policy [Policy Text Block] Income Taxes Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block] Stock-based Compensation Earnings Per Share, Policy [Policy Text Block] Net Loss per Common Share New Accounting Pronouncements, Policy [Policy Text Block] Recent Accounting Pronouncements Schedules of Concentration of Risk, by Risk Factor [Table Text Block] Schedule of the Company's significant third-party payers and their related revenue as a percentage of total revenue Allowance for Credit Losses on Financing Receivables [Table Text Block] Schedule of balance of allowance for doubtful accounts, including charges to bad debt expense and write-offs, net of recoveries Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Schedule of the calculation of basic and diluted net loss per common share Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] Schedule of outstanding shares of common stock equivalents that have been excluded from diluted net loss per common share Schedule of Accrued Liabilities [Table Text Block] Schedule of accrued liabilities Fair Value, Assets Measured on Recurring Basis [Table Text Block] Schedule of fair value of the Company's financial assets measured on a recurring basis Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] Summary of the changes in the fair value of the Company's Level 3 financial liabilities, which are measured on a recurring basis Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Schedule of the fair value of the Company's financial assets and liabilities measured on a recurring basis Fair Value, Liabilities Measured on Recurring Basis [Table Text Block] Schedule of fair value of the Company's liabilities measured on a recurring basis Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block] Schedule of future minimum lease payments under non-cancelable operating leases Tabular disclosure of number of common shares reserved for future issuance. Schedule of Common Stock Capital Shares Reserved for Future Issuance [Table Text Block] Schedule of reserved shares of common stock for issuance Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Award Type [Axis] Share Based Compensation Arrangements By Share Based Payment Award Award Type And Plan Name [Domain] Equity Award [Domain] An arrangement whereby an employee or non-employee is entitled to receive in the future, subject to vesting and other restrictions, a number of shares in the entity at a specified price, as defined in the agreement, excluding options granted as bonus related compensation. Employee And Non Employee Stock Option Excluding Bonus Compensation [Member] Employee and Non Employee Stock Option Excluding Bonus Compensation [Member] An arrangement whereby an employee is entitled to receive in the future, subject to vesting and other restrictions, a number of shares in the entity at a specified price, as defined in the agreement, as bonus related compensation. Employee Stock Option Bonus Compensation [Member] Employee Stock Option Bonus Compensation [Member] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Stock incentive plans Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] Summary of activity under the Company's stock option plans Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block] Summary of outstanding and exercisable stock options Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block] Summary of stock based compensation expense related to stock options Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] Schedule of assumptions used to calculate estimated grant date fair value of employee stock options using the Black-Scholes option-pricing valuation model Deferred Revenue, by Arrangement, Disclosure [Table Text Block] Schedule of unamortized balance of the co-promotion fee reflected in the Company's condensed balance sheets Number of Operating Segments Number of operating segments Concentration Risk [Table] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain]