Roka Bioscience (ROKA) 10-Q 12 Nov 15 2015 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2015	Nov. 09, 2015
Document And Entity Information [Abstract]
Document type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2015
Document Fiscal Year Focus	2,015
Document Fiscal Period Focus	Q3
Trading Symbol	ROKA
Entity Registrant Name	ROKA BIOSCIENCE, INC.
Entity Central Index Key	1,472,343
Current Fiscal Year End Date	--12-31
Entity Filer Category	Smaller Reporting Company
Entity Common Stock, Shares Outstanding		18,069,968

Condensed Balance Sheets (unaud

Condensed Balance Sheets (unaudited) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Current Assets:
Cash and cash equivalents	$ 6,949	$ 7,503
Short-term marketable securities	30,946	36,231
Trade accounts receivable, net of $0 allowance for doubtful accounts	681	670
Inventories	4,366	4,930
Prepaid expenses and other current assets	1,975	2,115
Total current assets	44,917	51,449
Long-term marketable securities	0	13,366
Property and equipment, net	10,524	12,186
Intangible assets, net	23,345	26,156
Goodwill	360	360
Other assets	264	262
Total assets	79,410	103,779
Current Liabilities:
Accounts payable	413	1,134
Short-term deferred payments	1,660	695
Notes payable, current	9,811	9,910
Accrued expenses and other current liabilities	2,723	2,125
Total current liabilities	14,607	13,864
Deferred payments	10,187	10,457
Deferred tax liabilities	49	49
Other long-term liabilities	321	334
Total liabilities	$ 25,164	$ 24,704
Commitments and Contingencies (See Note 11)
Common stock, $0.001 par value: 500,000,000 shares of Common Stock authorized; 18,050,024 shares issued and 18,045,058 shares outstanding, respectively at September 30, 2015; 17,660,432 shares issued and 17,658,373 shares outstanding at December 31, 2014	$ 18	$ 18
Additional paid-in capital	213,846	212,069
Treasury stock, at cost: 6,319 shares at September 30, 2015 and 2,059 shares at December 31, 2014	(22)	(8)
Accumulated deficit	(159,596)	(133,004)
Total liabilities and stockholders’ equity	54,246	79,075
Total liabilities and stockholders' equity	$ 79,410	$ 103,779

Condensed Balance Sheets (unau3

Condensed Balance Sheets (unaudited) (Parenthetical) - USD ($)	Sep. 30, 2015	Dec. 31, 2014
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 0	$ 0
Common stock par value (in USD per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	500,000,000	500,000,000
Common stock, shares issued (in shares)	18,077,197	17,660,432
Common stock, shares outstanding (in shares)	18,070,878	17,658,373
Treasury stock (in shares)	6,319	2,059

Condensed Statements of Operati

Condensed Statements of Operations and Comprehensive Loss (unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Income Statement [Abstract]
Revenue	$ 1,508	$ 1,483	$ 4,484	$ 3,701
Operating expenses:
Cost of revenue	1,672	2,578	5,391	5,416
Research and development	2,058	1,922	5,823	5,991
Selling, general and administrative	4,924	4,618	15,453	14,214
Amortization of intangible assets	937	738	2,811	822
Total operating expenses	9,591	9,856	29,478	26,443
Loss from operations	(8,083)	(8,373)	(24,994)	(22,742)
Other income (expense):
Change in fair value of financial instruments	0	(223)	0	(785)
Interest income (expense), net	(404)	(476)	(1,588)	(1,244)
Loss before income taxes	(8,487)	(9,072)	(26,582)	(24,771)
Income tax provision (benefit)	4	11	10	28
Net loss and comprehensive loss	$ (8,491)	$ (9,083)	$ (26,592)	$ (24,799)
Net Loss per Common Share:
Basic and diluted (in USD per share)	$ (0.49)	$ (0.64)	$ (1.54)	$ (4.78)
Weighted average common shares outstanding used in computing net loss per common share:
Basic and diluted (in shares)	17,303,490	14,153,715	17,262,033	5,188,516

Condensed Statement of Converti

Condensed Statement of Convertible Preferred Stock and Stockholders' Equity (Deficit) (unaudited) - USD ($) $ in Thousands	Total	Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]	IPO [Member]	IPO [Member]Common Stock [Member]	IPO [Member]Additional Paid-in Capital [Member]	Royalty Reduction [Member]	Royalty Reduction [Member]Common Stock [Member]	Royalty Reduction [Member]Additional Paid-in Capital [Member]	Treasury Stock [Member]
Beginning Balance (in shares) at Dec. 31, 2013		114,737,351	1,185,065
Beginning Balance at Dec. 31, 2013	$ (81,344)	$ 127,797	$ 8	$ 19,422	$ (100,774)							$ 0
Series E convertible preferred stock issuance costs	0	$ (99)
Stock-based compensation expense	1,019			1,019
Issuance of common stock from initial public offering, net of underwriters’ discounts and issuance costs (in shares)							5,000,000
Issuance of common stock from initial public offering, net of underwriters’ discounts and issuance costs						$ 53,214	$ 5	$ 53,209
Conversion of convertible preferred stock into Common Stock (in shares)		(114,737,351)	10,494,557
Conversion of convertible preferred stock into Common Stock	127,698	$ (127,698)	$ 4	127,694
Issuance of Warrants for Common Stock	1,364			1,364
Issuance of common stock upon exercise of option in amended license agreement (in shares)										865,063
Issuance of common stock upon exercise of option in amended license agreement									$ 9,092	$ 1	$ 9,091
Issuance of restricted shares to employees, net of shares withheld for taxes (in shares)			(2,059)
Issuance of restricted shares to employees, net of shares withheld for taxes	(8)											(8)
Exercise of options for Common Stock (in shares)			115,747
Exercise of options for Common Stock	270			270
Net loss	(32,230)				(32,230)
Ending Balance (in shares) at Dec. 31, 2014		0	17,658,373
Ending Balance at Dec. 31, 2014	79,075	$ 0	$ 18	212,069	(133,004)							(8)
Stock-based compensation expense	1,600			1,600
Issuance of Warrants for Common Stock	100			100
Issuance of restricted shares to employees, net of shares withheld for taxes (in shares)			370,766
Issuance of restricted shares to employees, net of shares withheld for taxes	(14)											(14)
Exercise of options for Common Stock (in shares)			41,739
Exercise of options for Common Stock	77			77
Net loss	(26,592)				(26,592)
Ending Balance (in shares) at Sep. 30, 2015		0	18,070,878
Ending Balance at Sep. 30, 2015	$ 54,246	$ 0	$ 18	$ 213,846	$ (159,596)							$ (22)

Condensed Statements of Cash Fl

Condensed Statements of Cash Flows (unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Cash flows from operating activities
Net loss	$ (26,592)	$ (24,799)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	4,543	2,690
Change in fair value of financial instruments	0	785
Loss on disposal of property and equipment	0	98
Provisions for inventory	374	991
Share-based compensation expense	1,600	765
Non-cash interest expense	1,138	800
Changes in operating assets and liabilities:
Accounts receivable	(154)	(549)
Inventories	189	(2,005)
Prepaid expenses and other assets	607	492
Accounts payable and accrued expenses	0	(397)
Deferred taxes	0	3,135
Other liabilities	(12)	(2)
Net cash used in operating activities	(18,307)	(17,996)
Cash flows from investing activities
Purchases of property and equipment	(165)	(199)
Proceeds from sale of property and equipment	71	60
Purchase of marketable securities	(9,856)	0
Proceeds from maturities of marketable securities	28,040	0
Payment pursuant to amended license agreement and option exercise	0	(10,500)
Net cash provided by (used in) investing activities	18,090	(10,639)
Cash flows from financing activities
Net proceeds from issuance of convertible preferred stock and warrants	0	(99)
Net proceeds from issuance of debt and warrants	4,950	5,000
Principal repayments	(5,350)	0
Proceeds from exercise of stock options	77	270
Restricted shares withheld for taxes	(14)	0
Proceeds from issuance of common stock, net of issuance costs	0	53,585
Net cash provided by financing activities	(337)	58,756
Net change in cash and cash equivalents	(554)	30,121
Cash and cash equivalents, beginning of period	7,503	32,728
Cash and cash equivalents, end of period	$ 6,949	$ 62,849

Business Overview

Business Overview	9 Months Ended
	Sep. 30, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Business Overview	BUSINESS OVERVIEW Business Roka Bioscience, Inc. (“Roka” or “the Company”) is focused on the development and commercialization of molecular assay technologies for the detection of foodborne pathogens. The Company was established in September 2009 through the acquisition of industrial testing assets and technology from Gen-Probe Incorporated, which was subsequently acquired by Hologic, Inc. (herein referred to as “Gen-Probe”). The Company has limited capital resources, has experienced negative cash flows from operations and has incurred net losses since inception. The Company expects to continue to experience negative cash flows from operations and incur net losses in the near term as it devotes substantially all of its efforts on commercialization of its products and continued product development. The Company’s business is subject to significant risks and its ability to successfully develop, manufacture and commercialize proprietary products is dependent upon many factors which include, but are not limited to, risks and uncertainties associated with the supply of molecular diagnostic instruments (“Atlas instruments”) and materials, product development, manufacturing scale-up, attracting and retaining key personnel, customer acceptance as well as competition. On July 22, 2014, the Company completed an initial public offering ("IPO") in which it sold 5,000,000 shares of common stock at $12.00 per share, before underwriting discounts. The Company received $53.2 million of net proceeds from the offering after deducting underwriting discounts, commissions and offering expenses. In connection with the closing of the IPO, all shares of the Company’s Class A common stock (“Common A”) and Class B common stock (“Common B”) were converted into a new class of common stock ("Common Stock") on a 1:1 basis and all shares of Series B Convertible Preferred Stock (“Series B”), Series C Convertible Preferred Stock (“Series C”), Series D Convertible Preferred Stock (“Series D”) and Series E Convertible Preferred Stock (“Series E”), collectively referred to as “Convertible Preferred Stock”, were converted into Common Stock at their respective conversion ratios. The Company will need to raise additional capital through the sale of equity and/or debt securities in the future. There is no assurance that the Company will be able to raise needed capital under acceptable terms, if at all. The sale of additional equity may dilute existing shareholders and newly issued shares may contain senior rights and preferences compared to currently outstanding common stock. Issued debt securities may contain covenants and limit the Company’s ability to pay dividends or make other distributions to stockholders. In addition, the Company’s debt agreement contains certain clauses which allow the lenders to require repayment of the debt based on subjective factors regarding the Company’s business and performance if considered a material adverse change by the lender. Concentration of Suppliers The Company relies on single source suppliers, including Gen-Probe, for certain components and materials used in its products, including its Atlas Detection Assays. Since the Company’s contracts with these suppliers, including Gen-Probe, do not commit the suppliers to carry inventory or to make available any minimum quantities, the Company may be unable to obtain adequate supplies in a timely manner or on commercially reasonable terms. If the Company loses such suppliers, or its suppliers encounter financial hardships, the Company may not be able to identify or enter into agreements with alternative suppliers on a timely basis on acceptable terms, if at all. Transitioning to a new supplier could be time consuming, may be expensive, may result in an interruption in the Company’s operations and could affect the performance specifications of the Company’s products. If the Company should encounter delays or difficulties in securing the quality and quantity of materials required for its products, the Company’s ability to manufacture its products would be interrupted which could adversely affect sales.

Summary of Significant Accounti

Summary of Significant Accounting Policies	9 Months Ended
	Sep. 30, 2015
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Basis of Presentation The accompanying unaudited condensed financial statements of Roka Bioscience, Inc. have been prepared by the Company in accordance with United States generally accepted accounting principles (“U.S. GAAP”) for interim financial reporting, which do not conform in all respects to the requirements of U.S. GAAP for annual financial statements. The information included in this quarterly report on Form 10-Q should be read in conjunction with the Company’s audited financial statements included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2014 filed with the SEC on March 27, 2015 (the “2014 Form 10-K”). Accordingly, these condensed notes to the unaudited financial statements should be read in conjunction with the 2014 audited financial statements and notes thereto prepared in accordance with U.S. GAAP. The unaudited financial statements have been prepared using accounting policies that are consistent with the policies used in preparing the Company’s audited financial statements for the year ended December 31, 2014. The condensed Balance Sheet as of December 31, 2014 was derived from the Company’s audited financial statements, but does not include all disclosures required by accounting principles generally accepted in the United States. The unaudited financial statements reflect all normal and recurring adjustments necessary, if any, for a fair statement of the Company’s financial position and results of operations for the interim periods presented. The results of operations for the three and nine months ended September 30, 2015 are not necessarily indicative of the results to be expected for the year ending December 31, 2015 or for any other future annual or interim period. There have been no changes in the significant accounting policies from those included in the 2014 Form 10-K. However, in order to further clarify the Company's policy with respect to impairment of long-lived assets, below please find a description of such policy. Impairment of Long-Lived Assets The Company’s long-lived assets are primarily comprised of intangible assets and property, plant and equipment. The Company evaluates its finite-lived intangible assets and property, plant and equipment, for impairment whenever events or changes in circumstances indicate the carrying value of an asset or group of assets is not recoverable. If these circumstances exist, recoverability of assets to be held and used is measured by a comparison of the carrying amount of an asset group to future undiscounted cash flows expected to be generated by the asset group. If the Company’s estimated undiscounted future cash flows are below the asset group’s carrying value, the Company may recognize an impairment charge measured by its fair value. Common A and Common B Reverse Stock Split In July 2014, the Company’s board of directors authorized and the Company’s shareholders approved an 11.04:1 reverse stock split of the Company’s Common A and Common B shares, effective on July 3, 2014. In addition, effective on the date of the reverse stock split, the conversion ratio of Convertible Preferred Stock was adjusted by a factor of 11.04 and consequently, each share of Series B, Series C and Series E became convertible into approximately 0.0906 shares of Common Stock and each share of Series D became convertible into approximately 0.0937 shares of Common Stock. As stated in Note 1, all shares of Common A, Common B and Convertible Preferred Stock converted into Common Stock upon the completion of the Company's IPO. The Company’s historical share and per share information have been retroactively adjusted to give effect to this reverse split and corresponding change in conversion ratio. New Accounting Pronouncements From time to time, new accounting pronouncements are issued by the Financial Accounting Standards Board (“FASB”) or other standard setting bodies and adopted by the Company as of the specified effective date. In July 2015, the FASB issued ASU No. 2015-11, Simplifying the Measurement of Inventory. This standard amends existing guidance and requires entities to measure most inventory at the lower of cost and net realizable value. This standard is effective for annual reporting periods beginning after December 15, 2016, and early adoption is permitted. This standard is to be applied on a prospective basis and upon adoption, entities must disclose the nature of and reason for the accounting change. The Company is currently in the process of evaluating the impact this new guidance will have on its financial statements. In April 2015, the FASB issued ASU No. 2015-05, Intangibles—Goodwill and Other—Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Fees Paid in a Cloud Computing Arrangement. This standard provides guidance to customers about whether a cloud computing arrangement includes a software license. If a cloud computing arrangement includes a software license, then the customer should account for the software license element of the arrangement consistent with the acquisition of other software licenses. If a cloud computing arrangement does not include a software license, the customer should account for the arrangement as a service contract. This amendment is effective for annual periods, including interim periods within those annual periods, beginning after December 15, 2015, and early adoption is permitted. The Company has evaluated this new guidance and determined it will not have an impact on the Company's financial statements. In August 2014, the FASB issued ASU No. 2014-15, Presentation of Financial Statements—Going Concern (Subtopic 205-40): Disclosure of Uncertainties about an Entity’s Ability to Continue as a Going Concern , which is intended to define management’s responsibility to evaluate whether there is substantial doubt about an organization’s ability to continue as a going concern and to provide related footnote disclosures. This ASU provides guidance to an organization’s management, with principles and definitions that are intended to reduce diversity in the timing and content of disclosures that are commonly provided by organizations today in the financial statement footnotes. The amendments are effective for annual periods ending after December 15, 2016, and interim periods within annual periods beginning after December 15, 2016, and early adoption is permitted. The Company does not believe this new guidance will have a material impact on its financial statements. In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers . This standard outlines a single comprehensive model for entities to use in accounting for revenue arising from contracts with customers and supersedes most current revenue recognition guidance. ASU 2014-09 provides companies with two implementation methods. Companies can choose to apply the standard retrospectively to each prior reporting period presented (full retrospective application) or retrospectively with the cumulative effect of initially applying the standard as an adjustment to the opening balance of retained earnings of the annual reporting period that includes the date of initial application (modified retrospective application). This ASU is effective for annual periods ending after December 15, 2016, and interim periods within annual periods beginning after December 15, 2016. In August 2015, the FASB issued ASU 2015-14, Revenue from Contracts with Customers - Deferral of the Effective Date . This ASU defers the effective date of Update 2014-09 for all entities by one year, requiring the guidance in ASU 2014-09 to be applied for annual reporting periods beginning after December 15, 2017, including interim reporting periods within that reporting period. Additionally, this ASU permits earlier application only as of annual reporting periods beginning after December 15, 2016, including interim reporting periods within that reporting period. The Company is currently in the process of evaluating the impact this new guidance will have on its financial statements. Adoption of New Accounting Principle In April 2015, the FASB issued Accounting Standards Update (“ASU”) No. 2015-03, Interest - Imputation of Interest: Simplifying the Presentation of Debt Issuance Costs which is intended to simplify the accounting for and presentation of debt issuance costs. This ASU requires debt issuance costs to no longer be capitalized as an asset on the balance sheet and amortized as a deferred charge, and instead be treated as a direct deduction from the face amount of the note. This guidance is effective for annual reporting periods beginning after December 15, 2015, including interim periods within that reporting period, and early application is permitted. The Company adopted the new guidance beginning in the interim period ended June 30, 2015 and has applied the guidance to its financial statements on a retrospective basis, wherein the balance sheet of each individual period presented has been adjusted to reflect the period-specific effects of applying the new guidance. The application of this new guidance did not have a material impact on the Company's financial statements. There were no cumulative changes to the Statement of Operations and Comprehensive Loss or the Statement of Convertible Preferred Stock and Stockholders’ Equity (Deficit); changes to the Balance Sheet as of December 31, 2014 as a result of this new accounting principle are noted below (amounts in thousands): As of December 31, 2014 Adjusted As previously reported Change Other assets 262 308 (46 ) Total assets 103,779 103,825 (46 ) Notes payable, current 9,910 9,956 (46 ) Total current liabilities 13,864 13,910 (46 ) Total liabilities 24,704 24,750 (46 ) Total liabilities and stockholders' equity 103,779 103,825 (46 )

Cash and Cash Equivalents

Cash and Cash Equivalents	9 Months Ended
	Sep. 30, 2015
Cash and Cash Equivalents [Abstract]
Cash and Cash Equivalents	CASH AND CASH EQUIVALENTS The Company’s entire balance of Cash and cash equivalents as of September 30, 2015 was held in demand accounts with one financial institution, which subjects the Company to significant concentrations of credit risk.

Marketable Securities

Marketable Securities	9 Months Ended
	Sep. 30, 2015
Investments, Debt and Equity Securities [Abstract]
Marketable Securities	MARKETABLE SECURITIES As of September 30, 2015 and December 31, 2014, the fair value of held-to-maturity marketable securities by type of security was as follows (amounts in thousands): Amortized Cost Gross Unrealized Holding Gains Gross Unrealized Holding Losses Aggregate Fair Value September 30, 2015 Short-term marketable securities Debt securities 30,946 3 (13 ) 30,936 December 31, 2014 Short-term marketable securities Debt securities 36,231 2 (36 ) 36,197 Long-term marketable securities Debt securities 13,366 4 (32 ) 13,338 Marketable securities held by the Company consist of United States treasury bills, commercial paper, U.S. government-related debt, and corporate debt securities. All short-term marketable securities held by the Company mature within one year and all long-term marketable securities mature after one year but in less than five years from the respective balance sheet date.

Inventories

Inventories	9 Months Ended
	Sep. 30, 2015
Inventory Disclosure [Abstract]
Inventories	INVENTORIES The following table provides details of the Company’s net inventories (amounts in thousands): As of September 30, As of December 31, 2015 2014 Raw materials $ 1,744 $ 1,914 Work in process — 11 Finished goods 2,622 3,005 $ 4,366 $ 4,930

Property and Equipment

Property and Equipment	9 Months Ended
	Sep. 30, 2015
Property, Plant and Equipment [Abstract]
Property and Equipment	PROPERTY AND EQUIPMENT The following table provides details of the Company’s property and equipment (amounts in thousands): As of September 30, As of December 31, 2015 2014 Atlas instruments placed with customers $ 4,589 $ 3,875 Atlas instruments intended for placement (1) 5,314 6,204 Manufacturing equipment 2,779 2,753 Laboratory equipment 3,026 2,953 Computer and office equipment 1,480 1,469 Leasehold improvements 1,435 1,380 Software 1,142 1,142 Total property and equipment $ 19,765 $ 19,776 Less: Accumulated depreciation (9,241 ) (7,590 ) Total $ 10,524 $ 12,186 (1) The Company does not depreciate Atlas instruments prior to the instruments being placed with customers. As of September 30, 2015 and December 31, 2014 , the cost of Atlas instruments, which represents equipment on lease or held for lease, was $8.2 million and $8.9 million , respectively, net of accumulated depreciation of $1.7 million and $1.2 million , respectively. Expenses for depreciation of property and equipment were incurred as follows (amounts in thousands): For the Three Months Ended September 30, For the Nine Months Ended September 30, 2015 2014 2015 2014 Depreciation expense $ 548 $ 623 $ 1,732 $ 1,867

Intangible Assets

Intangible Assets	9 Months Ended
	Sep. 30, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible Assets	INTANGIBLE ASSETS In June 2014, the Company entered into an amendment to its license agreement with Gen-Probe. Under the amendment, the Company obtained a two -year option to reduce the royalty rate it pays to Gen-Probe in exchange for an option payment of $2.5 million . Upon completion of its IPO in July 2014, the Company exercised its option and issued to Gen-Probe 865,063 shares of common stock valued at $10.51 per share on the issuance date and made a cash payment of $8.0 million . The Company is required to make additional cash payments of $5.0 million on January 1, 2018 and $5.0 million on January 1, 2020. The aggregate cash and stock payments made to Gen-Probe along with the present value of the two $5.0 million payments described above were recorded as a $26.6 million addition to the Company's intangible technology asset in Intangible assets on the Balance Sheet and will be amortized on a straight-line basis through December 31, 2021, the end of the estimated remaining life of the technology asset. See Note 9 for further details on the additional required future cash payments described above. Pursuant to the terms of the license agreement amendment, the Company committed to additional future contingent payments, as described in Note 11 below. If made, such additional payments will further reduce the royalty rate the Company pays to Gen-Probe, and will be recorded as additions to the Company's intangible technology asset upon payment and amortized over the estimated remaining life of the technology asset. The Company assesses its intangible and other long-lived assets for impairment whenever events or other changes in circumstances suggest that the carrying value of an asset group may not be recoverable based on its undiscounted future cash flows. If the Company’s estimated undiscounted future cash flows are below the asset group’s carrying value, the Company may recognize an impairment charge measured by its fair value. During the third quarter of 2015, the Company prepared revised projections for revenue and expenses, which indicated continued cash flow losses for the Company, and as a result, the Company determined a triggering event had occurred. The Company completed an assessment of the asset group including the intangible asset for recoverability. The recoverability assessment was based upon probability-weighted cash flow estimates resulting from updated revenue and expense projections and an appropriate terminal value. Based on the impairment assessment, the Company determined that the asset group including the intangible asset was not impaired. The following table summarizes the Company's intangible asset as of the periods presented (amounts in thousands): September 30, 2015 December 31, 2014 Intangible asset, gross 28,259 28,259 Accumulated amortization (4,914 ) (2,103 ) Intangible asset, net 23,345 26,156

Accrued Expenses and Other Curr

Accrued Expenses and Other Current Liabilities	9 Months Ended
	Sep. 30, 2015
Payables and Accruals [Abstract]
Accrued Expenses and Other Current Liabilities	ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES The following table provides details of the Company’s accrued expenses (amounts in thousands): As of September 30, As of December 31, 2015 2014 Employee related $ 2,016 $ 1,116 Professional services 296 235 Other 411 774 Total accrued expenses and other current liabilities $ 2,723 $ 2,125

Deferred Payments

Deferred Payments	9 Months Ended
	Sep. 30, 2015
Other Liabilities Disclosure [Abstract]
Deferred Payments	DEFERRED PAYMENTS Gen-Probe supply agreement In May 2011 , the Company entered into a supply agreement with Gen-Probe to purchase Atlas instruments. Pursuant to the terms of the agreement, the Company can defer up to one half of the purchase price for up to 54 months from the date of delivery. The deferred amounts do not bear interest, and the Company has recorded the imputed interest component as a reduction of the deferred payment and as a reduction of the asset cost. The supply agreement provides for variable repayment terms based on a percentage of net sales as defined in the agreement, and the Company has estimated its net sales in determining amounts due for the 54 month term. The following table summarizes the amounts deferred under this agreement (amounts in thousands): As of September 30, As of December 31, 2015 2014 Current Deferred payments, gross $ 1,990 $ 1,079 Imputed interest (330 ) (384 ) Deferred payments, net $ 1,660 $ 695 Long-term Deferred payments, gross $ 2,729 $ 3,683 Imputed interest (226 ) (464 ) Deferred payments, net $ 2,503 $ 3,219 The Company estimated the interest rate implicit in the extended payment terms by considering the rate at which it could obtain financing of a similar nature from other sources at the date of each transaction, as well as prevailing rates for similar debt instruments of issuers with similar credit ratings. The estimated effective interest rate used ranges from 9.9% to 11.2% . In the three and nine months ended September 30, 2015 , the Company recorded approximately $0.1 million and $0.3 million , respectively, and in the three and nine months ended September 30, 2014 , the Company recorded approximately $0.1 million and $0.3 million , respectively as non-cash interest expense related to the deferred payments pursuant to the supply agreement with Gen-Probe. Gen-Probe license amendment The amendment to the license agreement with Gen-Probe detailed in Note 7 includes a $5.0 million payment due on January 1, 2018 and a $5.0 million payment due on January 1, 2020. Under the terms of the amendment, no interest payments are required and no interest rate is stated. The Company determined that imputed interest must be calculated and recognized in accordance with ASC-835, and the payments are recorded in Deferred payments on the Balance Sheet at their present value based upon a 7.6% interest rate for the payment due on January 1, 2018 and a 9.0% interest rate for the payment due on January 1, 2020. The difference between the present value and the amount payable is accreted to Deferred payments over the respective term with a corresponding charge to Interest expense .

Notes Payable

Notes Payable	9 Months Ended
	Sep. 30, 2015
Debt Disclosure [Abstract]
Notes Payable	NOTES PAYABLE In November 2013, the Company entered into two loan and security agreements. One agreement was entered into with Comerica Bank (“Comerica”) and another agreement was entered into with TriplePoint Capital LLC (“TriplePoint”). Upon closing of the two agreements, the Company borrowed $5.0 million under the loan and security agreement with Comerica (the “Comerica Loan”). In March 2014, the Company borrowed $5.0 million under the loan and security agreement with TriplePoint (the “TriplePoint Loan”). In May 2015, the Company paid off the remaining amounts outstanding and due under the TriplePoint Loan, which consisted of $4.6 million in principal and a $0.4 million final payment fee, and simultaneously amended the Comerica Loan (the “Comerica Amendment”). The Comerica Amendment increased the borrowing under the Comerica Loan to $10.0 million and extended the interest-only period until December 31, 2015. Beginning January 1, 2016, the Company will make monthly payments which will consist of accrued interest and equal principal payments in accordance with a 30 -month amortization schedule. The interest rate under the Comerica Amendment remains the same as under the original Comerica Loan, which accrues interest at Comerica’s Prime Referenced Rate (as defined in the loan agreement with Comerica) plus 3.15% , subject to a floor of the daily adjusting LIBOR rate plus 2.5% . As of September 30, 2015 , and since inception, the rate was 6.4% . If the Company has at least $30.0 million in cash and marketable securities as of December 31, 2015, the Company has the option to extend the interest-only period through March 31, 2016. If such interest-only election is made, the interest rate will increase by 0.25% . Additionally, the Company will then make monthly payments which will consist of accrued interest and equal principal payments in accordance with a 22 -month amortization schedule. In connection with the Comerica Loan and the Comerica Amendment, the Company recorded a liability for the note of $9.8 million , net of expenses paid to Comerica, the value of the warrants issued to Comerica and the incremental value due to the amendment of the original Comerica warrant at the time of the repricing. The difference between the liability recorded and the face value of the note will be accreted to Notes payable over the term of the loan with a corresponding charge to Interest expense . Pursuant to the Comerica Amendment, the Company is required to maintain at least $5.0 million of unrestricted cash and/or marketable securities with Comerica at all times. As of September 30, 2015 and during the period since the Company entered into the Comerica Amendment, the Company has been in compliance with this requirement. Additionally, the Comerica Loan contains various covenants that limit the Company’s ability to engage in specified types of transactions, including limiting the Company’s ability to; sell, transfer, lease or dispose of certain assets; engage in certain mergers and consolidations; incur debt or encumber or permit liens on certain assets, make certain restricted payments, including paying dividends on, or repurchasing or making distributions with respect to, the Company’s Common Stock; and enter into certain transactions with affiliates. In connection with the closing of the loan and security agreements in November 2013, the Company issued warrants to Comerica and TriplePoint, see Note 15 for further details. In connection with the Comerica Amendment, the Company issued an additional warrant to Comerica to purchase up to an aggregate of 52,265 shares of Common Stock at $2.87 per share and modified the exercise price of the original warrant granted to Comerica under the Comerica Loan from $14.08 per share to $2.87 per share. The value of the new warrant and the incremental value due to the amendment of the original Comerica warrant were recorded as a reduction to Notes payable with a corresponding offset to Additional paid-in capital . In connection with the repayment of the TriplePoint Loan, the Company recorded approximately $0.2 million of Interest expense as the difference between the amount recorded in the Company's financial records and the amount paid. As of September 30, 2015 , the entire balance of $9.8 million has been classified as Notes payable, current on the Balance Sheet, although only $3.0 million is due within one year. The remaining $6.8 million has also been classified as Notes payable, current because the Comerica Loan agreement contains a material adverse change clause which allows Comerica to require repayment of the debt based on subjective factors regarding the Company’s business and performance.

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2015
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	COMMITMENTS AND CONTINGENCIES Operating Leases The Company has not entered into any new operating leases or amended any existing operating leases during the nine months ended September 30, 2015 . Commitments During the nine months ended September 30, 2015 , there have been no significant changes to the Company’s commitments as disclosed in the Company’s most recent audited financial statements. Contingent liabilities In addition to the commitments disclosed in the Company’s most recent audited financial statements, the amendment to the license agreement with Gen-Probe detailed in Note 9 provides for additional milestone payments of up to $6.0 million which will further reduce the royalty rate paid. Such payments are required to be made upon meeting certain revenue milestones or may be made at the election of the Company prior to meeting the revenue milestones. Legal Matters The Company may periodically become subject to legal proceedings and claims arising in connection with its business. Except as set forth below, the Company is not currently involved in any legal proceedings, nor are any claims pending against the Company. A putative securities class action originally captioned Ding v. Roka Bioscience, Inc. , Case No. 3:14-cv-8020, was filed against the Company and certain of its officers and directors in the United States District Court for the District of New Jersey on December 24, 2014, on behalf of a putative class of persons and entities who had purchased or otherwise acquired securities pursuant or traceable to the Registration Statement for the Company’s IPO. The original putative class period ran from July 17 through November 6, 2014. The original complaint asserted claims under the Securities Act of 1933 and contended that the IPO Registration Statement was false and misleading, or omitted allegedly material information, in connection with the Company’s statements about its placement of Atlas instruments and its expectations of future growth and increased market share, and the Company’s alleged failure to disclose “known trends and uncertainties about the Company’s sales.” The alleged misrepresentations and omissions purportedly came to light when the Company issued its third-quarter 2014 earnings release on November 6, 2014. Pursuant to the Private Securities Litigation Reform Act of 1995, two applicants filed motions on February 23, 2015 for appointment as lead plaintiff. On March 23, 2015, the applicant with the smaller loss agreed not to oppose the application for lead plaintiff filed by the applicant with the larger loss. The court appointed Stanley Yedlowski as lead plaintiff and The Rosen Law Firm as lead counsel on April 21, 2015. The lead plaintiff then filed an amended complaint, captioned Stanley Yedlowski v. Roka Bioscience, Inc., Case No. 14-cv-8020, on June 23, 2015. The amended complaint pleads Securities Act claims on behalf of persons and entities who purchased or otherwise acquired Roka securities pursuant or traceable to the IPO Registration Statement during an extended putative class period, running from July 17, 2014 through March 26, 2015. The amended complaint alleges that the Registration Statement was false or misleading in that it failed to disclose that the Company’s customers purportedly were experiencing false positives and other usage issues with the Company’s Listeria assays apparently arising from the customers’ employees’ inability to follow the Company’s Listeria assay workflow. The amended complaint alleges that the full extent of the purported misstatements and omissions was not revealed until March 26, 2015. Defendants filed a motion on August 25, 2015 to dismiss the amended complaint, and plaintiffs filed an opposition to that motion on October 9, 2015. The parties have agreed to attempt to resolve the case through mediation in December 2015. The Company believes that the claims in the securities class action are without merit and, if the mediation is unsuccessful, the Company intends to defend the litigation vigorously, and expects to incur costs associated with defending the securities class action. The Company has various insurance policies related to the risks associated with its business, including directors’ and officers’ liability insurance policies. However, there is no assurance that the Company will be successful in its defense of the securities class action, and there is no assurance that the insurance coverage will be sufficient or that the insurance carriers will cover all claims or litigation costs. At this early stage of the litigation, the Company cannot accurately predict the ultimate outcome of this matter. Due to the inherent uncertainties of litigation, the Company cannot reasonably predict the timing or outcomes, or estimate the amount of loss, if any, or their effect, if any, on its financial statements. The Company sells its products in various jurisdictions and is subject to federal, state and local taxes including, where applicable, sales and use tax. While the Company believes that it has properly paid or accrued for all such taxes based on its interpretation of applicable law, tax laws are complex and interpretations differ. Periodically, the Company may be audited by taxing authorities, and it is possible that additional assessments may be made in the future.

Fair Value Measurements

Fair Value Measurements	9 Months Ended
	Sep. 30, 2015
Fair Value Disclosures [Abstract]
Fair Value Measurements	FAIR VALUE MEASUREMENTS The Company’s financial instruments consist of cash and cash equivalents, marketable securities , trade accounts receivable, accounts payable, short-term deferred payments, deferred payments, notes payable, accrued expenses and Convertible Preferred Stock Warrants. The carrying amounts of cash and cash equivalents, trade accounts receivable, accounts payable, short-term deferred payments and accrued expenses approximate their fair values because of the short-term nature of the instruments, or, in the case of the deferred payments and notes payable , because the interest rates the Company believes it could obtain for similar borrowings is similar to its existing interest rates. The carrying amount of the Company's marketable securities is the amortized cost basis based upon their held-to-maturity classification. The following table summarizes the fair value information for the Company’s cash held in money market deposit accounts and its marketable securities at September 30, 2015 and December 31, 2014 (amounts in thousands): Fair value measurements using: Carrying Value Quoted Prices in Active Markets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Financial Assets and Liabilities Carried at Fair Value As of September 30, 2015 Financial Assets: Money market deposit accounts $ 4,547 $ 4,547 — — As of December 31, 2014 Financial Assets: Money market deposit accounts $ 5,741 $ 5,741 — — Financial Assets Carried at Amortized Cost As of September 30, 2015 Short-term marketable securities $ 30,946 $ 5,004 25,932 — As of December 31, 2014 Short-term marketable securities $ 36,231 $ 10,081 26,116 — Long-term marketable securities $ 13,366 $ 2,001 11,337 — A portion of the Company’s cash and cash equivalents are held in money market deposit accounts and a portion of the Company's short-term marketable securities are United States treasury bills, each of which are classified within Level 1 of the fair value hierarchy because they are valued using quoted market prices. The Company's short-term marketable securities and long-term marketable securities not classified within Level 1 of the fair value hierarchy are comprised of commercial paper, U.S. government-related debt, and corporate debt securities, all of which are classified as Level 2 within the fair value hierarchy. The Company estimates the fair values of these marketable securities by taking into consideration valuations obtained from its investment manager, which utilizes industry standard valuation models, including both income and market-based approaches, for which all significant inputs are observable, either directly or indirectly, to estimate fair value. There have been no transfers between levels during the reporting period. There were no convertible preferred stock warrants outstanding during the nine months ended September 30, 2015 . In conjunction with the closing of the Company’s IPO, the warrants exercisable for shares of Preferred Stock were automatically converted into warrants exercisable for shares of its Common Stock, resulting in the reclassification of the related convertible preferred stock warrant liability to Additional paid-in capital as the warrants to purchase shares of common stock met the criteria for equity classification. Per ASC 820, Fair Value Measurements and Disclosures , (“ASC 820”) the Convertible Preferred Stock Warrants which were outstanding during the nine months ended September 30, 2014 were revalued to their fair value, using the Black-Scholes option-pricing model, at September 30, 2014 and the change in fair value is reflected in the Statement of Operations and Comprehensive Loss. The table below provides a summary of the changes in the Convertible preferred stock warrant liability during the nine months ended September 30, 2014 (amounts in thousands): For the Nine Months Ended September 30, 2014 Balance at beginning of period $ 212 Increase in Series E warrant shares 135 Change in fair value of warrants (1) 1,017 Reclassification to equity (2) $ (1,364 ) Balance at end of period $ — (1) Amount includes $0.7 million of prior period fair value adjustments. (2) The warrants were re-measured to fair value and reclassified to additional paid-in capital upon the completion of the Company's initial public offering.

Convertible Preferred Stock and

Convertible Preferred Stock and Stockholders' Equity	9 Months Ended
	Sep. 30, 2015
Equity [Abstract]
Convertible Preferred Stock and Stockholders' Equity	CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS’ EQUITY Registration rights Prior to the IPO, the Company had multiple classes of preferred stock for which shares were authorized, issued and outstanding. At the closing of the Company's IPO, all shares of Convertible Preferred Stock converted into 10,494,557 shares of Common Stock. The holders of these shares have demand, short-form and piggyback registration rights under the terms of an investor rights agreement between such holders and the Company which will expire upon the earlier of (i) five years after the Company's IPO and (ii) as to a holder, at such time as all registrable securities held by such holder may be sold without restriction under Rule 144. Upon request of holders of at least 51% of the registrable securities, the Company is required to file a registration statement under the Securities Act covering the registration of such shares, subject to terms and conditions set forth in the agreement. Authorized stock In connection with the seventh amended and restated certificate of incorporation effective on July 22, 2014, the total authorized shares of stock was changed to 520,000,000 of which 500,000,000 shares are designated as common stock with a par value of $0.001 per share and 20,000,000 shares are designated as "blank check" preferred stock with a par value of $0.001 per share.

Stock-Based Compensation

Stock-Based Compensation	9 Months Ended
	Sep. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-Based Compensation	STOCK-BASED COMPENSATION Effective upon the closing of the IPO, the Company adopted the Roka Bioscience, Inc. 2014 Equity Incentive Plan (the "2014 Plan"). The 2014 Plan initially made available 1,086,956 shares to be granted to employees, officers, directors, consultants, advisors or other individual service providers of the Company. The number of shares of Common Stock available for issuance under the 2014 Plan shall automatically increase on January 1st of each year for a period of ten years commencing on January 1, 2015 and ending on (and including) January 1, 2024, in an amount equal to 3% of the total number of shares of Common Stock outstanding on December 31st of the preceding calendar year. Under the Roka Bioscience, Inc. 2009 Equity Incentive Plan (the “2009 Plan”), as amended on June 13, 2013, incentive and non-qualified stock options and restricted stock may be granted for up to a maximum of 2,028,850 shares to employees, consultants and directors of the Company. Effective upon adoption of the 2014 Plan, the Company does not intend to issue additional shares under the 2009 Plan. Stock options and shares of restricted stock granted under the 2009 Plan and the 2014 Plan have a maximum contractual term of ten years from the date of grant and generally vest over four years . For stock options, the exercise price may not be less than the fair value of the stock on the grant date. The Company recognized stock compensation expense as follows (amounts in thousands): For the Three Months Ended For the Nine Months Ended September 30, 2015 2014 2015 2014 Stock options $ 209 $ 41 $ 584 $ 174 Restricted stock $ 300 $ 200 $ 1,016 $ 591 Under the 2014 Plan, the Company granted approximately 940,000 stock options and approximately 375,000 shares of restricted stock during the nine months ended September 30, 2015 , valued at approximately $2.7 million and $1.6 million , respectively. Under the 2009 Plan, the Company granted approximately 4,000 stock options valued at approximately $0.02 million and no shares of restricted stock during the nine months ended September 30, 2014 . The Company determines the fair value of stock option awards at the date of grant using a Black-Scholes valuation model. This model requires the Company to make assumptions and judgments on the expected volatility, dividend yield, the risk-free interest rate and the expected term of the stock options. The following ranges of assumptions were utilized for stock options granted during the periods indicated: For the Nine Months Ended September 30, 2015 2014 Expected life in years 5.8-6.3 5.9-6.0 Interest rate 1.06%-1.80% 2.01%-2.04% Volatility 75% - 90% 60% Dividend yield — — The Company estimates the expected life of its employee stock options using the “simplified” method, whereby the expected life equals the arithmetic average of the vesting term and the original contractual term of the option due to its lack of sufficient historical data. The risk-free interest rates are based on the U.S. Treasury yield curve in effect at the time of grant for periods corresponding with the expected life of the option. The expected stock price volatility rates are based on average historical volatilities of the common stock of the Company and a group of public companies in similar industries. The Company has no history or expectations of paying dividends on its Common Stock and therefore uses a zero percent dividend yield in the Black-Scholes option pricing model.

Warrants

Warrants	9 Months Ended
	Sep. 30, 2015
Warrants and Rights Note Disclosure [Abstract]
Warrants	WARRANTS As of September 30, 2015 , there were 323,078 warrant shares outstanding with a weighted average exercise price of $9.78 per share. See Note 12 for a summary of the changes in the Convertible preferred stock warrant liability for the nine months ended September 30, 2014 . Warrants Issued prior to IPO Immediately prior to the Company's IPO, the Company had Series B Warrants outstanding which allowed their holders to purchase 2,480,000 shares of Series B at an exercise price of $1.00 per share. In connection with the IPO, the warrants converted into warrants to purchase Common Stock at their conversion rate of approximately 0.0906 common warrant shares to one Series B warrant share. Such warrants expire in September 2016 , whereupon any warrants that remain unexercised will be exercised automatically in whole in a cashless exercise resulting in an issuance, to the holders of the warrants, the number of shares with a value equal to the intrinsic value of the warrants at the time of expiry. In connection with the closing of the loan and security agreements in November 2013 discussed in Note 10, the Company issued warrants to Comerica and TriplePoint to purchase up to an aggregate of 352,941 shares of Series E with an exercise price of $1.28 . Upon issuance, the Company recorded liabilities of approximately $0.03 million and $0.06 million for the warrants issued to Comerica and TriplePoint, respectively. The initial fair value of the warrant issued to Comerica of approximately $0.03 million was deemed a discount on the debt issued by Comerica and is being accreted to interest expense over the term of the Comerica Loan. The initial fair value of the warrants issued to TriplePoint of approximately $0.06 million were capitalized in Other assets on the Balance Sheet as part of debt issuance costs and were amortized to Interest expense. In connection with the borrowings made under the TriplePoint Loan in March 2014, one of the TriplePoint warrants became exercisable for an additional 156,863 shares of Series E. The related fair value of approximately $0.1 million was deemed a discount on the debt issued by TriplePoint and was accreted to interest expense over the term of the TriplePoint Loan through the early payoff in May 2015, at which time the remaining discount was charged to interest expense. In connection with the IPO, the Series E warrants converted into warrants to purchase common stock at their conversion rate of approximately 0.0906 common warrant shares to one Series E warrant share and as a result became exercisable for 31,968 shares of Common Stock with an exercise price of $14.08 . Warrants Issued Subsequent to IPO In connection with the Comerica Amendment on May 29, 2015, the Company issued an additional warrant to Comerica to purchase up to an aggregate of 52,265 shares of Common Stock at $2.87 per share and modified the exercise price of the original warrant granted to Comerica to purchase up to an aggregate of 10,656 shares of common stock from $14.08 per share to $2.87 per share.

Net Loss Per Share

Net Loss Per Share	9 Months Ended
	Sep. 30, 2015
Earnings Per Share [Abstract]
Net Loss per Share	NET LOSS PER SHARE Basic net loss per share is calculated by dividing net loss applicable to common stockholders by the weighted-average shares outstanding during the period, without consideration for common stock equivalents. The weighted-average common shares outstanding excludes unvested restricted stock which although such shares are legally issued and outstanding, are not required to share in losses of the Company and are therefore excluded from the net loss per share calculation. Diluted net loss per share is calculated by adjusting the weighted-average shares outstanding for the dilutive effect of common stock equivalents outstanding for the period, determined using the treasury-stock method. For purposes of the diluted net loss per share calculation, Convertible Preferred Stock, stock options and warrants are considered to be common stock equivalents but are excluded from the calculation of diluted net loss per share because their effect would be anti-dilutive. Therefore, basic and diluted net loss per share applicable to common stockholders were the same for all periods presented. Prior to the IPO, the Company had two classes of common stock outstanding, and in connection with the IPO, the two classes were converted into a new class of Common Stock. The tables in this footnote are retroactively adjusted to show the results as if only the new class of Common Stock was outstanding for the entirety of each of the respective periods. For the Three Months Ended September 30, For the Nine Months Ended September 30, 2015 2014 2015 2014 Net loss applicable to common shareholders (thousands) $ (8,491 ) $ (9,083 ) $ (26,592 ) $ (24,799 ) Basic and diluted weighted average common shares outstanding 17,303,490 14,153,715 17,262,033 5,188,516 Basic and diluted loss per share $ (0.49 ) $ (0.64 ) $ (1.54 ) $ (4.78 ) As the Company incurred a loss for the three and nine months ended September 30, 2015 and 2014 , all unvested restricted stock awards were excluded from the calculation of basic net loss per share and all potential Common Stock shares issuable for Convertible Preferred Stock, stock options and warrants were excluded from the calculation of diluted net loss per share, as the effect of including them would have been anti-dilutive. Had the Company not incurred a loss, the dilutive effect of the unvested restricted stock awards on basic weighted average common shares outstanding and the dilutive effect of potential Common Stock shares issuable for Convertible Preferred Stock, stock options and warrants on the weighted-average number of Common Stock shares outstanding would have been as follows: For the Three Months Ended September 30, For the Nine Months Ended September 30, 2015 2014 2015 2014 Basic weighted average shares outstanding 17,303,490 14,153,715 17,262,033 5,188,516 Dilutive effect of unvested restricted stock — 301,846 71,860 262,861 Basic weighted average shares outstanding had the Company not incurred a loss 17,303,490 14,455,561 17,333,893 5,451,377 Dilutive effect of Convertible Preferred Stock — 1,939,212 — 7,642,775 Dilutive effect of warrants — 208 — 69 Dilutive effect of stock options 78,284 339,272 97,444 363,792 Diluted weighted average shares outstanding had the Company not incurred a loss 17,381,774 16,734,253 17,431,337 13,458,013

Segment Information

Segment Information	9 Months Ended
	Sep. 30, 2015
Segment Reporting [Abstract]
Segment Information	SEGMENT INFORMATION The Company operates in a single reportable segment. During each of the nine months ended September 30, 2015 , and the nine months ended September 30, 2014 , the Company had four customers which each generated more than 10% of the Company’s revenues. These customers accounted for revenues as follows (amounts in thousands): Nine Months Ended September 30, 2015 2014 Customer A 1,040 648 Customer B 889 1,086 Customer C 623 631 Customer D 463 411

Summary of Significant Accoun24

Summary of Significant Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2015
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The accompanying unaudited condensed financial statements of Roka Bioscience, Inc. have been prepared by the Company in accordance with United States generally accepted accounting principles (“U.S. GAAP”) for interim financial reporting, which do not conform in all respects to the requirements of U.S. GAAP for annual financial statements. The information included in this quarterly report on Form 10-Q should be read in conjunction with the Company’s audited financial statements included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2014 filed with the SEC on March 27, 2015 (the “2014 Form 10-K”). Accordingly, these condensed notes to the unaudited financial statements should be read in conjunction with the 2014 audited financial statements and notes thereto prepared in accordance with U.S. GAAP. The unaudited financial statements have been prepared using accounting policies that are consistent with the policies used in preparing the Company’s audited financial statements for the year ended December 31, 2014. The condensed Balance Sheet as of December 31, 2014 was derived from the Company’s audited financial statements, but does not include all disclosures required by accounting principles generally accepted in the United States. The unaudited financial statements reflect all normal and recurring adjustments necessary, if any, for a fair statement of the Company’s financial position and results of operations for the interim periods presented. The results of operations for the three and nine months ended September 30, 2015 are not necessarily indicative of the results to be expected for the year ending December 31, 2015 or for any other future annual or interim period. There have been no changes in the significant accounting policies from those included in the 2014 Form 10-K.
Impairment of Long-Lived Assets	Impairment of Long-Lived Assets The Company’s long-lived assets are primarily comprised of intangible assets and property, plant and equipment. The Company evaluates its finite-lived intangible assets and property, plant and equipment, for impairment whenever events or changes in circumstances indicate the carrying value of an asset or group of assets is not recoverable. If these circumstances exist, recoverability of assets to be held and used is measured by a comparison of the carrying amount of an asset group to future undiscounted cash flows expected to be generated by the asset group. If the Company’s estimated undiscounted future cash flows are below the asset group’s carrying value, the Company may recognize an impairment charge measured by its fair value.
New Accounting Pronouncements	New Accounting Pronouncements From time to time, new accounting pronouncements are issued by the Financial Accounting Standards Board (“FASB”) or other standard setting bodies and adopted by the Company as of the specified effective date. In July 2015, the FASB issued ASU No. 2015-11, Simplifying the Measurement of Inventory. This standard amends existing guidance and requires entities to measure most inventory at the lower of cost and net realizable value. This standard is effective for annual reporting periods beginning after December 15, 2016, and early adoption is permitted. This standard is to be applied on a prospective basis and upon adoption, entities must disclose the nature of and reason for the accounting change. The Company is currently in the process of evaluating the impact this new guidance will have on its financial statements. In April 2015, the FASB issued ASU No. 2015-05, Intangibles—Goodwill and Other—Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Fees Paid in a Cloud Computing Arrangement. This standard provides guidance to customers about whether a cloud computing arrangement includes a software license. If a cloud computing arrangement includes a software license, then the customer should account for the software license element of the arrangement consistent with the acquisition of other software licenses. If a cloud computing arrangement does not include a software license, the customer should account for the arrangement as a service contract. This amendment is effective for annual periods, including interim periods within those annual periods, beginning after December 15, 2015, and early adoption is permitted. The Company has evaluated this new guidance and determined it will not have an impact on the Company's financial statements. In August 2014, the FASB issued ASU No. 2014-15, Presentation of Financial Statements—Going Concern (Subtopic 205-40): Disclosure of Uncertainties about an Entity’s Ability to Continue as a Going Concern , which is intended to define management’s responsibility to evaluate whether there is substantial doubt about an organization’s ability to continue as a going concern and to provide related footnote disclosures. This ASU provides guidance to an organization’s management, with principles and definitions that are intended to reduce diversity in the timing and content of disclosures that are commonly provided by organizations today in the financial statement footnotes. The amendments are effective for annual periods ending after December 15, 2016, and interim periods within annual periods beginning after December 15, 2016, and early adoption is permitted. The Company does not believe this new guidance will have a material impact on its financial statements. In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers . This standard outlines a single comprehensive model for entities to use in accounting for revenue arising from contracts with customers and supersedes most current revenue recognition guidance. ASU 2014-09 provides companies with two implementation methods. Companies can choose to apply the standard retrospectively to each prior reporting period presented (full retrospective application) or retrospectively with the cumulative effect of initially applying the standard as an adjustment to the opening balance of retained earnings of the annual reporting period that includes the date of initial application (modified retrospective application). This ASU is effective for annual periods ending after December 15, 2016, and interim periods within annual periods beginning after December 15, 2016. In August 2015, the FASB issued ASU 2015-14, Revenue from Contracts with Customers - Deferral of the Effective Date . This ASU defers the effective date of Update 2014-09 for all entities by one year, requiring the guidance in ASU 2014-09 to be applied for annual reporting periods beginning after December 15, 2017, including interim reporting periods within that reporting period. Additionally, this ASU permits earlier application only as of annual reporting periods beginning after December 15, 2016, including interim reporting periods within that reporting period. The Company is currently in the process of evaluating the impact this new guidance will have on its financial statements.
Debt Issuance Costs	In April 2015, the FASB issued Accounting Standards Update (“ASU”) No. 2015-03, Interest - Imputation of Interest: Simplifying the Presentation of Debt Issuance Costs which is intended to simplify the accounting for and presentation of debt issuance costs. This ASU requires debt issuance costs to no longer be capitalized as an asset on the balance sheet and amortized as a deferred charge, and instead be treated as a direct deduction from the face amount of the note. This guidance is effective for annual reporting periods beginning after December 15, 2015, including interim periods within that reporting period, and early application is permitted. The Company adopted the new guidance beginning in the interim period ended June 30, 2015 and has applied the guidance to its financial statements on a retrospective basis, wherein the balance sheet of each individual period presented has been adjusted to reflect the period-specific effects of applying the new guidance. The application of this new guidance did not have a material impact on the Company's financial statements.

Summary of Significant Accoun25

Summary of Significant Accounting Policies (Tables)	9 Months Ended
	Sep. 30, 2015
Accounting Policies [Abstract]
Schedule of Changes as a Result of New Accounting Principle	There were no cumulative changes to the Statement of Operations and Comprehensive Loss or the Statement of Convertible Preferred Stock and Stockholders’ Equity (Deficit); changes to the Balance Sheet as of December 31, 2014 as a result of this new accounting principle are noted below (amounts in thousands): As of December 31, 2014 Adjusted As previously reported Change Other assets 262 308 (46 ) Total assets 103,779 103,825 (46 ) Notes payable, current 9,910 9,956 (46 ) Total current liabilities 13,864 13,910 (46 ) Total liabilities 24,704 24,750 (46 ) Total liabilities and stockholders' equity 103,779 103,825 (46 )

Marketable Securities (Tables)

Marketable Securities (Tables)	9 Months Ended
	Sep. 30, 2015
Investments, Debt and Equity Securities [Abstract]
Summary of the Fair Value of Held-to-Maturity Marketable Securities	As of September 30, 2015 and December 31, 2014, the fair value of held-to-maturity marketable securities by type of security was as follows (amounts in thousands): Amortized Cost Gross Unrealized Holding Gains Gross Unrealized Holding Losses Aggregate Fair Value September 30, 2015 Short-term marketable securities Debt securities 30,946 3 (13 ) 30,936 December 31, 2014 Short-term marketable securities Debt securities 36,231 2 (36 ) 36,197 Long-term marketable securities Debt securities 13,366 4 (32 ) 13,338

Inventories (Tables)

Inventories (Tables)	9 Months Ended
	Sep. 30, 2015
Inventory Disclosure [Abstract]
Summary of Net Inventories	The following table provides details of the Company’s net inventories (amounts in thousands): As of September 30, As of December 31, 2015 2014 Raw materials $ 1,744 $ 1,914 Work in process — 11 Finished goods 2,622 3,005 $ 4,366 $ 4,930

Property and Equipment (Tables)

Property and Equipment (Tables)	9 Months Ended
	Sep. 30, 2015
Property, Plant and Equipment [Abstract]
Schedule of Property and Equipment	The following table provides details of the Company’s property and equipment (amounts in thousands): As of September 30, As of December 31, 2015 2014 Atlas instruments placed with customers $ 4,589 $ 3,875 Atlas instruments intended for placement (1) 5,314 6,204 Manufacturing equipment 2,779 2,753 Laboratory equipment 3,026 2,953 Computer and office equipment 1,480 1,469 Leasehold improvements 1,435 1,380 Software 1,142 1,142 Total property and equipment $ 19,765 $ 19,776 Less: Accumulated depreciation (9,241 ) (7,590 ) Total $ 10,524 $ 12,186
Schedule of Expenses for Depreciation of Property and Equipment	Expenses for depreciation of property and equipment were incurred as follows (amounts in thousands): For the Three Months Ended September 30, For the Nine Months Ended September 30, 2015 2014 2015 2014 Depreciation expense $ 548 $ 623 $ 1,732 $ 1,867

Intangible Assets (Tables)

Intangible Assets (Tables)	9 Months Ended
	Sep. 30, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Summary of Intangible Assets	The following table summarizes the Company's intangible asset as of the periods presented (amounts in thousands): September 30, 2015 December 31, 2014 Intangible asset, gross 28,259 28,259 Accumulated amortization (4,914 ) (2,103 ) Intangible asset, net 23,345 26,156

Accrued Expenses and Other Cu30

Accrued Expenses and Other Current Liabilities (Tables)	9 Months Ended
	Sep. 30, 2015
Payables and Accruals [Abstract]
Summary of Accrued Expenses	The following table provides details of the Company’s accrued expenses (amounts in thousands): As of September 30, As of December 31, 2015 2014 Employee related $ 2,016 $ 1,116 Professional services 296 235 Other 411 774 Total accrued expenses and other current liabilities $ 2,723 $ 2,125

Deferred Payments (Tables)

Deferred Payments (Tables)	9 Months Ended
	Sep. 30, 2015
Other Liabilities Disclosure [Abstract]
Summary of Amounts Deferred under Supply Agreement	The following table summarizes the amounts deferred under this agreement (amounts in thousands): As of September 30, As of December 31, 2015 2014 Current Deferred payments, gross $ 1,990 $ 1,079 Imputed interest (330 ) (384 ) Deferred payments, net $ 1,660 $ 695 Long-term Deferred payments, gross $ 2,729 $ 3,683 Imputed interest (226 ) (464 ) Deferred payments, net $ 2,503 $ 3,219

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2015
Fair Value Disclosures [Abstract]
Summary of Fair Value Information for Cash Held in Money Market Deposit Accounts and Marketable Securities	The following table summarizes the fair value information for the Company’s cash held in money market deposit accounts and its marketable securities at September 30, 2015 and December 31, 2014 (amounts in thousands): Fair value measurements using: Carrying Value Quoted Prices in Active Markets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Financial Assets and Liabilities Carried at Fair Value As of September 30, 2015 Financial Assets: Money market deposit accounts $ 4,547 $ 4,547 — — As of December 31, 2014 Financial Assets: Money market deposit accounts $ 5,741 $ 5,741 — — Financial Assets Carried at Amortized Cost As of September 30, 2015 Short-term marketable securities $ 30,946 $ 5,004 25,932 — As of December 31, 2014 Short-term marketable securities $ 36,231 $ 10,081 26,116 — Long-term marketable securities $ 13,366 $ 2,001 11,337 —
Summary of the Changes in the Convertible Preferred Stock Warrant Liability	The table below provides a summary of the changes in the Convertible preferred stock warrant liability during the nine months ended September 30, 2014 (amounts in thousands): For the Nine Months Ended September 30, 2014 Balance at beginning of period $ 212 Increase in Series E warrant shares 135 Change in fair value of warrants (1) 1,017 Reclassification to equity (2) $ (1,364 ) Balance at end of period $ — (1) Amount includes $0.7 million of prior period fair value adjustments. (2) The warrants were re-measured to fair value and reclassified to additional paid-in capital upon the completion of the Company's initial public offering.

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	9 Months Ended
	Sep. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Schedule of Stock Compensation Expense	The Company recognized stock compensation expense as follows (amounts in thousands): For the Three Months Ended For the Nine Months Ended September 30, 2015 2014 2015 2014 Stock options $ 209 $ 41 $ 584 $ 174 Restricted stock $ 300 $ 200 $ 1,016 $ 591
Summary of Range of Assumptions Utilized for Stock Options Granted	The following ranges of assumptions were utilized for stock options granted during the periods indicated: For the Nine Months Ended September 30, 2015 2014 Expected life in years 5.8-6.3 5.9-6.0 Interest rate 1.06%-1.80% 2.01%-2.04% Volatility 75% - 90% 60% Dividend yield — —

Net Loss Per Share (Tables)

Net Loss Per Share (Tables)	9 Months Ended
	Sep. 30, 2015
Earnings Per Share [Abstract]
Schedule of Basic and Diluted Net Loss per Share Applicable to Common Stockholders	The tables in this footnote are retroactively adjusted to show the results as if only the new class of Common Stock was outstanding for the entirety of each of the respective periods. For the Three Months Ended September 30, For the Nine Months Ended September 30, 2015 2014 2015 2014 Net loss applicable to common shareholders (thousands) $ (8,491 ) $ (9,083 ) $ (26,592 ) $ (24,799 ) Basic and diluted weighted average common shares outstanding 17,303,490 14,153,715 17,262,033 5,188,516 Basic and diluted loss per share $ (0.49 ) $ (0.64 ) $ (1.54 ) $ (4.78 )
Schedule of Calculation of Weighted Average Shares Outstanding, Event of Not Incurring Loss	Had the Company not incurred a loss, the dilutive effect of the unvested restricted stock awards on basic weighted average common shares outstanding and the dilutive effect of potential Common Stock shares issuable for Convertible Preferred Stock, stock options and warrants on the weighted-average number of Common Stock shares outstanding would have been as follows: For the Three Months Ended September 30, For the Nine Months Ended September 30, 2015 2014 2015 2014 Basic weighted average shares outstanding 17,303,490 14,153,715 17,262,033 5,188,516 Dilutive effect of unvested restricted stock — 301,846 71,860 262,861 Basic weighted average shares outstanding had the Company not incurred a loss 17,303,490 14,455,561 17,333,893 5,451,377 Dilutive effect of Convertible Preferred Stock — 1,939,212 — 7,642,775 Dilutive effect of warrants — 208 — 69 Dilutive effect of stock options 78,284 339,272 97,444 363,792 Diluted weighted average shares outstanding had the Company not incurred a loss 17,381,774 16,734,253 17,431,337 13,458,013

Segment Information (Tables)

Segment Information (Tables)	9 Months Ended
	Sep. 30, 2015
Segment Reporting [Abstract]
Schedule of Revenue by Major Customers by Reporting Segments [Table Text Block]	These customers accounted for revenues as follows (amounts in thousands): Nine Months Ended September 30, 2015 2014 Customer A 1,040 648 Customer B 889 1,086 Customer C 623 631 Customer D 463 411

Business Overview - Narrative (

Business Overview - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands	Jul. 22, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Subsidiary, Sale of Stock [Line Items]
Proceeds from issuance of common stock, net of issuance costs		$ 0	$ 53,585
Common Class A and Class B [Member]
Subsidiary, Sale of Stock [Line Items]
Common stock, conversion basis	1:1
IPO [Member]
Subsidiary, Sale of Stock [Line Items]
Proceeds from issuance of common stock, net of issuance costs	$ 53,200
Common Stock [Member] | IPO [Member]
Subsidiary, Sale of Stock [Line Items]
Issuance of common stock from initial public offering, net of underwriters’ discounts and issuance costs (in shares)	5,000,000			5,000,000
IPO, price per share (in USD per share)	$ 12

Summary of Significant Accoun37

Summary of Significant Accounting Policies - Narrative (Details)	1 Months Ended
	Jul. 31, 2014
Convertible Preferred Stock [Member]
Summary Of Significant Accounting Policies [Line Items]
Reverse stock split of common stock	11.04:1 reverse stock split
Reverse stock split, conversion ratio	11.04
Series B, Series C and Series E Convertible Preferred Stock [Member]
Summary Of Significant Accounting Policies [Line Items]
Reverse stock split, conversion ratio	0.0906
Series D Convertible Preferred Stock [Member]
Summary Of Significant Accounting Policies [Line Items]
Reverse stock split, conversion ratio	0.0937

Summary of Significant Accoun38

Summary of Significant Accounting Policies - Schedule of Changes as a Result of New Accounting Principle (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Other assets	$ 264	$ 262
Total assets	79,410	103,779
Notes payable, current	9,811	9,910
Total current liabilities	14,607	13,864
Total liabilities	25,164	24,704
Total liabilities and stockholders' equity	$ 79,410	103,779
Adjusted [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Other assets		262
Total assets		103,779
Notes payable, current		9,910
Total current liabilities		13,864
Total liabilities		24,704
Total liabilities and stockholders' equity		103,779
As Previously Reported [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Other assets		308
Total assets		103,825
Notes payable, current		9,956
Total current liabilities		13,910
Total liabilities		24,750
Total liabilities and stockholders' equity		103,825
Change [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Other assets		(46)
Total assets		(46)
Notes payable, current		(46)
Total current liabilities		(46)
Total liabilities		(46)
Total liabilities and stockholders' equity		$ (46)

Cash and Cash Equivalents - Nar

Cash and Cash Equivalents - Narrative (Details)	Sep. 30, 2015financial_institution
Cash and Cash Equivalents [Member] | Credit Concentration Risk [Member]
Concentration Risk [Line Items]
Number of financial institutions	1

Marketable Securities - Summary

Marketable Securities - Summary of the Fair Value of Held-to-Maturity Marketable Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Short-term marketable securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt securities, Short-term, Amortized Cost	$ 30,946	$ 36,231
Gross Unrealized Holding Gains	3	2
Gross Unrealized Holding Losses	(13)	(36)
Debt securities, Short-term, Aggregate Fair Value	$ 30,936	36,197
Long-term marketable securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt securities, Long-term, Amortized Cost		13,366
Gross Unrealized Holding Gains		4
Gross Unrealized Holding Losses		(32)
Debt securities, Long-term, Aggregate Fair Value		$ 13,338

Marketable Securities - Narrati

Marketable Securities - Narrative (Details)	9 Months Ended
	Sep. 30, 2015
Short-term marketable securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Marketable securities, maturity period	1 year
Long-term marketable securities [Member] | Minimum [Member]
Schedule of Held-to-maturity Securities [Line Items]
Marketable securities, maturity period	1 year
Long-term marketable securities [Member] | Maximum [Member]
Schedule of Held-to-maturity Securities [Line Items]
Marketable securities, maturity period	5 years

Inventories - Summary of Net In

Inventories - Summary of Net Inventories (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Inventory Disclosure [Abstract]
Raw materials	$ 1,744	$ 1,914
Work in process	0	11
Finished goods	2,622	3,005
Inventory, net	$ 4,366	$ 4,930

Property and Equipment - Schedu

Property and Equipment - Schedule of Property and Equipment (Details) - USD ($) $ in Thousands		Sep. 30, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Property and Equipment, Gross		$ 19,765	$ 19,776
Less: Accumulated depreciation		(9,241)	(7,590)
Property and Equipment, Net		10,524	12,186
Instruments with Customers [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment, Gross		4,589	3,875
Instruments for Placement [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment, Gross	[1]	5,314	6,204
Manufacturing Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment, Gross		2,779	2,753
Laboratory Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment, Gross		3,026	2,953
Computers and Office Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment, Gross		1,480	1,469
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment, Gross		1,435	1,380
Software [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment, Gross		$ 1,142	$ 1,142
[1]	The Company does not depreciate Atlas instruments prior to the instruments being placed with customers.

Property and Equipment - Narrat

Property and Equipment - Narrative (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Cost of equipment on lease or held for lease, net of accumulated depreciation	$ 10,524	$ 12,186
Accumulated depreciation	9,241	7,590
Atlas Instrument [Member] | Equipment [Member]
Property, Plant and Equipment [Line Items]
Cost of equipment on lease or held for lease, net of accumulated depreciation	8,200	8,900
Accumulated depreciation	$ 1,700	$ 1,200

Property and Equipment - Sche45

Property and Equipment - Schedule of Expenses for Depreciation of Property and Equipment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Property, Plant and Equipment [Abstract]
Depreciation expense	$ 548	$ 623	$ 1,732	$ 1,867

Intangible Assets - Narrative (

Intangible Assets - Narrative (Details) - USD ($)	Jan. 01, 2020	Jan. 01, 2018	Jul. 31, 2014	Jun. 30, 2014	Dec. 31, 2014
Technology-Based Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible technology asset			$ 26,600,000
Royalty Reduction [Member] | Common Stock [Member]
Finite-Lived Intangible Assets [Line Items]
Issuance of common stock for royalty reduction (in shares)			865,063		865,063
Gen Probe [Member]
Finite-Lived Intangible Assets [Line Items]
Option agreement period				2 years
License agreement option payment				$ 2,500,000
Share price (in USD per share)			$ 10.51
Cash payment for royalties			$ 8,000,000
Gen Probe [Member] | Scenario, Forecast [Member]
Finite-Lived Intangible Assets [Line Items]
Cash payment for royalties	$ 5,000,000	$ 5,000,000

Intangible Assets - Summary of

Intangible Assets - Summary of Intangibles (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible asset, gross	$ 28,259	$ 28,259
Accumulated amortization	(4,914)	(2,103)
Intangible assets, net	$ 23,345	$ 26,156

Accrued Expenses and Other Cu48

Accrued Expenses and Other Current Liabilities - Summary of Accrued Expenses (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Payables and Accruals [Abstract]
Employee related	$ 2,016	$ 1,116
Professional services	296	235
Other	411	774
Total accrued expenses and other current liabilities	$ 2,723	$ 2,125

Deferred Payments - Narrative (

Deferred Payments - Narrative (Details) - USD ($)	Jan. 01, 2020	Jan. 01, 2018	Jul. 31, 2014	May. 31, 2011	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Other Liabilities [Line Items]
Non-cash interest expense related to the deferred payments					$ 100,000	$ 100,000	$ 300,000	$ 300,000
Gen Probe [Member] | January 1, 2018 [Member]
Other Liabilities [Line Items]
Royalty payment, present value interest rate							7.60%
Gen Probe [Member] | January 1, 2020 [Member]
Other Liabilities [Line Items]
Royalty payment, present value interest rate							9.00%
Gen Probe [Member] | Scenario, Forecast [Member]
Other Liabilities [Line Items]
Royalty payment	$ 5,000,000	$ 5,000,000
Minimum [Member]
Other Liabilities [Line Items]
Debt instrument effective percentage					9.90%		9.90%
Maximum [Member]
Other Liabilities [Line Items]
Debt instrument effective percentage					11.20%		11.20%
Gen Probe [Member]
Other Liabilities [Line Items]
Royalty payment			$ 8,000,000
Gen Probe [Member] | Scenario, Forecast [Member]
Other Liabilities [Line Items]
Royalty payment	$ 5,000,000	$ 5,000,000
Atlas Instrument [Member] | Gen Probe [Member]
Other Liabilities [Line Items]
Deferred payment period				54 months
Atlas Instrument [Member] | Gen Probe [Member] | Maximum [Member]
Other Liabilities [Line Items]
Deferred purchase price, percentage				50.00%

Deferred Payments - Summary of

Deferred Payments - Summary of Amounts Deferred under Supply Agreement (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Current
Deferred payments, gross	$ 1,990	$ 1,079
Imputed interest	(330)	(384)
Deferred payments, net	1,660	695
Long-term
Deferred payments, gross	2,729	3,683
Imputed interest	(226)	(464)
Deferred payments, net	$ 2,503	$ 3,219

Notes Payable - Narrative (Deta

Notes Payable - Narrative (Details)	Dec. 31, 2015USD ($)	May. 29, 2015USD ($)$ / sharesshares	Nov. 30, 2013USD ($)agreement	Sep. 30, 2015USD ($)$ / shares	Sep. 30, 2014USD ($)	Dec. 31, 2014USD ($)	Jul. 22, 2014$ / shares
Line of Credit Facility [Line Items]
Number of loan and security agreements | agreement			2
Principal amount repaid				$ 5,350,000	$ 0
Notes payable				$ 9,811,000		$ 9,910,000
Warrants outstanding share exercise price (in USD per share) | $ / shares				$ 9.78
Current notes payable				$ 3,000,000
Convertible Preferred Stock Series E [Member]
Line of Credit Facility [Line Items]
Warrants outstanding share exercise price (in USD per share) | $ / shares		$ 2.87
Common Stock [Member]
Line of Credit Facility [Line Items]
Additional warrant issued (in shares) | shares		52,265
Warrants outstanding share exercise price (in USD per share) | $ / shares							$ 14.08
Scenario, Forecast [Member]
Line of Credit Facility [Line Items]
Amortization period	22 months
Cash and marketable securities	$ 30,000,000
Interest rate increase	0.25%
Comerica Loan [Member]
Line of Credit Facility [Line Items]
Debt face amount				10,000,000
Cash and marketable securities				5,000,000
TriplePoint Loan [Member]
Line of Credit Facility [Line Items]
Principal amount repaid		$ 4,600,000
Final payment fee		400,000
Debt Instrument, Subjective Change Clause [Member]
Line of Credit Facility [Line Items]
Current notes payable				$ 6,800,000
Comerica Loan [Member]
Line of Credit Facility [Line Items]
Amounts borrowed			$ 5,000,000
Amortization period				30 months
Interest rate at period end				6.40%
Net of expenses paid to Comerica		9,800,000
Comerica Loan [Member] | London Interbank Offered Rate (LIBOR) [Member]
Line of Credit Facility [Line Items]
Minimum interest rate			2.50%
Additional minimum interest rate			3.15%
TriplePoint Loan [Member]
Line of Credit Facility [Line Items]
Amounts borrowed			$ 5,000,000
Interest expense		$ 200,000

Commitments and Contingencies -

Commitments and Contingencies - Narrative (Details)	Feb. 23, 2015Applicant	Sep. 30, 2015USD ($)
Commitment And Contingencies [Line Items]
Number of applicants to be appointed as lead plaintiff	2
Gen Probe [Member]
Commitment And Contingencies [Line Items]
Additional milestone payments | $		$ 6,000,000

Fair Value Measurements - Summa

Fair Value Measurements - Summary of Fair Value Information for Cash Held in Money Market Deposit Accounts and Marketable Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Financial Liabilities:
Short-term marketable securities	$ 30,946	$ 36,231
Long-term marketable securities	0	13,366
Debt Securities [Member]
Financial Liabilities:
Short-term marketable securities	30,946	36,231
Long-term marketable securities		13,366
Money Market Deposit Accounts [Member]
Financial Assets:
Money market deposit accounts	4,547	5,741
Quoted Prices in Active Markets (Level 1) [Member] | Debt Securities [Member]
Financial Liabilities:
Short-term marketable securities	5,004	10,081
Long-term marketable securities		2,001
Quoted Prices in Active Markets (Level 1) [Member] | Money Market Deposit Accounts [Member]
Financial Assets:
Money market deposit accounts	4,547	5,741
Significant Other Observable Inputs (Level 2) [Member] | Debt Securities [Member]
Financial Liabilities:
Short-term marketable securities	25,932	26,116
Long-term marketable securities		11,337
Significant Other Observable Inputs (Level 2) [Member] | Money Market Deposit Accounts [Member]
Financial Assets:
Money market deposit accounts	0	0
Significant Unobservable Inputs (Level 3) [Member] | Debt Securities [Member]
Financial Liabilities:
Short-term marketable securities	0	0
Long-term marketable securities		0
Significant Unobservable Inputs (Level 3) [Member] | Money Market Deposit Accounts [Member]
Financial Assets:
Money market deposit accounts	$ 0	$ 0

Fair Value Measurements - Narra

Fair Value Measurements - Narrative (Details)	Sep. 30, 2015shares
Class of Warrant or Right [Line Items]
Convertible preferred stock warrants outstanding (in shares)	323,078
Convertible Preferred Stock Warrants [Member]
Class of Warrant or Right [Line Items]
Convertible preferred stock warrants outstanding (in shares)	0

Fair Value Measurements - Sum55

Fair Value Measurements - Summary of the Changes in the Convertible Preferred Stock Warrant Liability (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2014USD ($)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	$ 212
Change in fair value of warrants	1,017	[1]
Reclassification to equity	(1,364)	[2]
Balance at end of period	0
Prior Period Adjustment [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Prior period fair value adjustment	700
Series E Warrants [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Increase in Series E warrant shares	$ 135
[1]	Amount includes $0.7 million of prior period fair value adjustments.
[2]	The warrants were re-measured to fair value and reclassified to additional paid-in capital upon the completion of the Company's initial public offering.

Convertible Preferred Stock a56

Convertible Preferred Stock and Stockholders' Equity - Narrative (Details) - $ / shares	Jul. 22, 2014	Sep. 30, 2015	Dec. 31, 2014
Temporary Equity [Line Items]
Registration rights, expiration term	5 years
Percentage of registrable securities		51.00%
Total stock, shares authorized (in shares)	520,000,000
Common stock, shares authorized (in shares)	500,000,000	500,000,000	500,000,000
Common stock, par or stated value per share (in USD per share)	$ 0.001	$ 0.001	$ 0.001
Preferred stock, shares authorized (in shares)	20,000,000
Preferred stock, par or stated value per share (in USD per share)	$ 0.001
Common Stock [Member]
Temporary Equity [Line Items]
Conversion of convertible preferred stock into Common Stock (in shares)	10,494,557		10,494,557

Stock-Based Compensation - Narr

Stock-Based Compensation - Narrative (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2015USD ($)shares	Sep. 30, 2014USD ($)shares	Jul. 22, 2014shares	Jun. 13, 2013shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum contractual term of restricted stock granted	10 years
Contractual term of restricted stock vested	4 years
Dividend yield	0.00%	0.00%
2009 Equity Incentive Plan [Member] | Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted (in shares)		4,000
Stock options granted, value | $		$ 20
2009 Equity Incentive Plan [Member] | Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stocks granted in the period (in shares)		0
2009 Equity Incentive Plan [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options and restricted shares granted (in shares)				2,028,850
2014 Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Period between share increases	10 years
Percent of increase	0.03
2014 Equity Incentive Plan [Member] | Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted (in shares)	940,000
Stock options granted, value | $	$ 2,700
2014 Equity Incentive Plan [Member] | Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stocks granted in the period (in shares)	375,000
Stock options granted, value | $	$ 1,600
2014 Equity Incentive Plan [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options and restricted shares granted (in shares)			1,086,956

Stock-Based Compensation - Sche

Stock-Based Compensation - Schedule of Stock Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock options	$ 209	$ 41	$ 584
Restricted stock	$ 300	$ 200	$ 1,016

Stock-Based Compensation - Summ

Stock-Based Compensation - Summary of Range of Assumptions Utilized for Stock Options Granted (Details)	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Volatility		60.00%
Dividend yield	0.00%	0.00%
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected life in years	5 years 9 months 7 days	5 years 10 months 24 days
Interest rate	1.06%	2.01%
Volatility	75.00%
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected life in years	6 years 3 months 15 days	6 years
Interest rate	1.80%	2.04%
Volatility	90.00%

Warrants - Narrative (Details)

Warrants - Narrative (Details) $ / shares in Units, $ in Thousands	Jul. 22, 2014$ / sharesshares	Nov. 30, 2013USD ($)$ / sharesshares	Sep. 30, 2015$ / sharesshares	May. 29, 2015shares	Mar. 31, 2014USD ($)shares
Class of Warrant or Right [Line Items]
Warrants outstanding to purchase shares (in shares)			323,078
Warrants outstanding share exercise price (in USD per share) | $ / shares			$ 9.78
Common Stock [Member]
Class of Warrant or Right [Line Items]
Warrants outstanding share exercise price (in USD per share) | $ / shares	$ 14.08
Additional warrant issued (in shares)				52,265
Number of shares for warrants exercisable (in shares)	31,968			10,656
Comerica Loan [Member]
Class of Warrant or Right [Line Items]
Warrants issued as payments | $		$ 30
TriplePoint Loan [Member]
Class of Warrant or Right [Line Items]
Warrants issued as payments | $		$ 60
Series B Warrants [Member]
Class of Warrant or Right [Line Items]
Warrants outstanding to purchase shares (in shares)	2,480,000
Warrants outstanding share exercise price (in USD per share) | $ / shares	$ 1
Warrants conversion ratio	0.0906
Series E Warrants [Member]
Class of Warrant or Right [Line Items]
Warrants outstanding to purchase shares (in shares)		352,941
Warrants outstanding share exercise price (in USD per share) | $ / shares		$ 1.2751
Warrants conversion ratio	0.0906
Series E Warrants [Member] | TriplePoint Loan [Member] | Second Tranche [Member]
Class of Warrant or Right [Line Items]
Additional warrant issued (in shares)					156,863
Additional issues shares value | $					$ 100

Net Loss Per Share - Schedule o

Net Loss Per Share - Schedule of Basic and Diluted Net Loss per Share Applicable to Common Stockholders (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Earnings Per Share [Abstract]
Net loss applicable to common shareholders (thousands)	$ (8,491)	$ (9,083)	$ (26,592)	$ (24,799)	$ (32,230)
Basic and diluted weighted average common shares outstanding (in shares)	17,303,490	14,153,715	17,262,033	5,188,516
Basic and diluted loss per share (in USD per share)	$ (0.49)	$ (0.64)	$ (1.54)	$ (4.78)

Net Loss Per Share - Schedule62

Net Loss Per Share - Schedule of Calculation of Weighted Average Shares Outstanding, Event of Not Incurring Loss (Details) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Earnings Per Share [Abstract]
Basic weighted average shares outstanding (in shares)	17,303,490	14,153,715	17,262,033	5,188,516
Dilutive effect of unvested restricted stock (in shares)	0	301,846	71,860	262,861
Basic weighted average shares outstanding had the Company not incurred a loss (in shares)	17,303,490	14,455,561	17,333,893	5,451,377
Dilutive effect of Convertible Preferred Stock (in shares)	0	1,939,212	0	7,642,775
Dilutive effect of warrants (in shares)	0	208	0	69
Dilutive effect of stock options (in shares)	78,284	339,272	97,444	363,792
Diluted weighted average shares outstanding had the Company not incurred a loss (in shares)	17,381,774	16,734,253	17,431,337	13,458,013

Segment Information - Narrative

Segment Information - Narrative (Details)	9 Months Ended
	Sep. 30, 2015SegmentCustomer	Sep. 30, 2014Customer
Revenue, Major Customer [Line Items]
Number of reportable segments | Segment	1
Revenue [Member]
Revenue, Major Customer [Line Items]
Number of customers accounted for more than 10% of revenues	4	4
Concentration risk percentage	10.00%	10.00%

Segment Information - Schedule

Segment Information - Schedule of Revenue by Major Customers (Details) - Customer Concentration Risk [Member] - Revenue [Member] - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Customer A [Member]
Revenue from External Customer [Line Items]
Revenues	$ 1,040	$ 648
Customers B [Member]
Revenue from External Customer [Line Items]
Revenues	889	1,086
Customer C [Member]
Revenue from External Customer [Line Items]
Revenues	623	631
Customer D [Member]
Revenue from External Customer [Line Items]
Revenues	$ 463	$ 411