10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 10-Q

x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

FOR THE QUARTERLY PERIOD ENDED JUNE 30, 2016

OR

¨ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

COMMISSION FILE NUMBER 001-36279

CARA THERAPEUTICS, INC.

(Exact name of registrant as specified in its charter)

Delaware	75-3175693
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)

4 Stamford Plaza 107 Elm Street 9th Floor Stamford, Connecticut	06902
(Address of registrant’s principal executive offices)	(Zip Code)

Registrant’s telephone number, including area code: (203) 406-3700

Indicate by check mark whether the registrant: (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    x  Yes    ¨  No.

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§ 232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).    x  Yes    ¨  No.

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer or a smaller reporting company. See definition of “large accelerated filer”, “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act.

Large accelerated filer	¨	Accelerated filer	x
Non-accelerated filer	¨	Smaller reporting company	¨

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).    ¨  Yes    x  No.

The number of outstanding shares of the registrant’s common stock, par value $0.001 per share, as of July 29, 2016 was: 27,282,863.

CARA THERAPEUTICS, INC.

INDEX TO FORM 10-Q

FOR THE QUARTERLY PERIOD ENDED JUNE 30, 2016

		PAGE NUMBER
PART I –FINANCIAL INFORMATION
Item 1.	Financial Statements (Unaudited):
	Condensed Balance Sheets as of June 30, 2016 and December 31, 2015		1
	Condensed Statements of Comprehensive Loss for the Three and Six Months Ended June 30, 2016 and 2015		2
	Condensed Statements of Stockholders’ Equity for the Six Months Ended June 30, 2016 and 2015		3
	Condensed Statements of Cash Flows for the Six Months Ended June 30, 2016 and 2015		4
	Notes to Condensed Financial Statements		5
Item 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations		17
Item 3.	Quantitative and Qualitative Disclosures About Market Risk		28
Item 4.	Controls and Procedures		28
PART II – OTHER INFORMATION
Item 1.	Legal Proceedings		29
Item 1A	Risk Factors		29
Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds		29
Item 3.	Defaults Upon Senior Securities		29
Item 4.	Mine Safety Disclosures		29
Item 5.	Other Information		29
Item 6.	Exhibits		30
	SIGNATURES		31

PART I

FINANCIAL INFORMATION

Item 1. Financial Statements.

CARA THERAPEUTICS, INC.

CONDENSED BALANCE SHEETS

(amounts in thousands, excluding share and per share data)

(unaudited)

	June 30, 2016			December 31, 2015
Assets
Current assets:
Cash and cash equivalents	$	3,545		$	15,101
Marketable securities		81,219			91,640
Income tax receivable		608			384
Other receivables		373			80
Prepaid expenses		3,398			1,729
Total current assets		89,143			108,934
Property and equipment, net		1,433			1,263
Restricted cash		1,469			700
Total assets	$	92,045		$	110,897
Liabilities and stockholders’ equity
Current liabilities:
Accounts payable and accrued expenses	$	8,168		$	5,268
Total current liabilities		8,168			5,268
Deferred lease obligation		1,289			585
Commitments and contingencies (Note 12)		—			—
Stockholders’ equity:
Preferred stock; $0.001 par value; 5,000,000 shares authorized at June 30, 2016 and December 31, 2015, zero shares issued and outstanding at June 30, 2016 and December 31, 2015.		—			—
Common stock; $0.001 par value; 100,000,000 shares authorized at June 30, 2016 and December 31, 2015, 27,282,863 shares and 27,254,863 shares issued and outstanding at June 30, 2016 and December 31, 2015, respectively		27			27
Additional paid-in capital		211,177			209,943
Accumulated deficit		(128,657	)		(104,891	)
Accumulated other comprehensive income (loss)		41			(35	)
Total stockholders’ equity		82,588			105,044
Total liabilities and stockholders’ equity	$	92,045		$	110,897

See Notes to Condensed Financial Statements.

1

CARA THERAPEUTICS, INC.

CONDENSED STATEMENTS OF COMPREHENSIVE LOSS

(amounts in thousands, excluding share and per share data)

(unaudited)

	Three Months Ended						Six Months Ended
	June 30, 2016			June 30, 2015			June 30, 2016			June 30, 2015
Revenue:
Collaborative revenue	$	—		$	874		$	—		$	1,363
Clinical compound revenue		79			—			86			—
Total revenue		79			874			86			1,363
Operating expenses:
Research and development		10,760			4,684			19,305			8,069
General and administrative		2,645			1,922			5,092			3,744
Total operating expenses		13,405			6,606			24,397			11,813
Operating loss		(13,326	)		(5,732	)		(24,311	)		(10,450	)
Other income		172			13			321			27
Loss before benefit from income taxes		(13,154	)		(5,719	)		(23,990	)		(10,423	)
Benefit from income taxes		79			35			224			50
Net loss	$	(13,075	)	$	(5,684	)	$	(23,766	)	$	(10,373	)
Net loss per share -Basic and Diluted	$	(0.48	)	$	(0.25	)	$	(0.87	)	$	(0.45	)
Weighted average shares:
Basic and Diluted		27,282,863			22,828,612			27,271,226			22,818,601
Other comprehensive income, net of tax of $0:
Unrealized gains on available-for-sale marketable securities		37			—			76			—
Total comprehensive loss	$	(13,038	)	$	(5,684	)	$	(23,690	)	$	(10,373	)

See Notes to Condensed Financial Statements.

2

CARA THERAPEUTICS, INC.

CONDENSED STATEMENTS OF STOCKHOLDERS’ EQUITY

(amounts in thousands except share and per share data)

(unaudited)

	Common Stock				Additional Paid-In		Accumulated			Accumulated Other Comprehensive			Total Stockholders’
	Shares		Amount		Capital		Deficit			Income (Loss)			Equity
Balance at December 31, 2014		22,802,039	$	23	$	131,840	$	(80,201	)	$	—		$	51,662
Stock-based compensation expense		—		—		1,146		—			—			1,146
Shares issued upon exercise of stock options		34,880		—		35		—			—			35
Net loss		—		—		—		(10,373	)		—			(10,373	)
Balance at June 30, 2015		22,836,919	$	23	$	133,021	$	(90,574	)	$	—		$	42,470
	Common Stock				Additional Paid-In		Accumulated			Accumulated Other Comprehensive			Total Stockholders’
	Shares		Amount		Capital		Deficit			Income (Loss)			Equity
Balance at December 31, 2015		27,254,863	$	27	$	209,943	$	(104,891	)	$	(35	)	$	105,044
Stock-based compensation expense		—		—		1,194		—			—			1,194
Shares issued upon exercise of stock options		28,000		—		40		—			—			40
Net loss		—		—		—		(23,766	)		—			(23,766	)
Other comprehensive income		—		—		—		—			76			76
Balance at June 30, 2016		27,282,863	$	27	$	211,177	$	(128,657	)	$	41		$	82,588

See Notes to Condensed Financial Statements.

3

CARA THERAPEUTICS, INC.

CONDENSED STATEMENTS OF CASH FLOWS

(amounts in thousands)

(unaudited)

	Six Months Ended
	June 30, 2016			June 30, 2015
Operating activities
Net loss	$	(23,766	)	$	(10,373	)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation expense		1,194			1,146
Depreciation and amortization		1,249			386
Accretion/amortization on available-for-sale marketable securities		(126	)		—
Deferred rent costs		(395	)		(142	)
Changes in operating assets and liabilities:
Income tax receivable		(224	)		(50	)
Other receivables		(171	)		—
Prepaid expenses		(1,669	)		(303	)
Accounts payable and accrued expenses		2,616			1,204
Deferred revenue		—			(1,363	)
Net cash used in operating activities		(21,292	)		(9,495	)
Investing activities
Proceeds from maturities of available-for-sale marketable securities		42,400			—
Proceeds from sale of available-for-sale marketable securities		10,900			—
Purchases of available-for-sale marketable securities		(42,677	)		—
Change in restricted cash		(769	)		—
Purchases of property and equipment		(158	)		(12	)
Net cash provided by (used in) investing activities		9,696			(12	)
Financing activities
Proceeds from the exercise of stock options		40			35
Net cash provided by financing activities		40			35
Net cash decrease for the period		(11,556	)		(9,472	)
Cash and cash equivalents at beginning of period		15,101			52,663
Cash and cash equivalents at end of period	$	3,545		$	43,191
Noncash investing and financing activities
Tenant improvements paid by landlord	$	1,094		$	—

See Notes to Condensed Financial Statements.

4

CARA THERAPEUTICS, INC.

NOTES TO CONDENSED FINANCIAL STATEMENTS

(amounts in thousands, except share and per share data)

(unaudited)

1. Business

Cara Therapeutics, Inc. (the “Company”, “we”, “our” or “us”) is a clinical-stage biopharmaceutical corporation formed on July 2, 2004. The Company is focused on developing and commercializing new chemical entities designed to alleviate pain and pruritus by selectively targeting peripheral kappa opioid receptors. The Company’s primary activities to date have been organizing and staffing the company, developing its product candidates, including conducting preclinical studies and clinical trials of CR845-based product candidates and raising capital.

As of June 30, 2016, the Company has raised aggregate net proceeds of approximately $204,800 from several rounds of equity financing, including its initial public offering, which closed in February 2014 and its follow-on offering, which closed in August 2015, and the issuance of debt. In addition, the Company received approximately $32,500 under its license agreements for CR845, primarily with Maruishi Pharmaceutical Co. Ltd., or Maruishi, and Chong Kun Dang Pharmaceutical Corp., or CKD, and an earlier product candidate for which development efforts ceased in 2007.

In connection with the license of rights to CR845 in Japan to Maruishi, and as part of the payments described above, in April 2013, the Company received an upfront payment of $15,000, and in August 2014 and September 2015, the Company received additional milestone payments of $480 and $1,725 (net of contractual foreign currency exchange adjustments), respectively. In connection with the license of rights to CR845 in South Korea to CKD, and as part of the payments described above, in 2012, the Company received aggregate upfront and milestone payments of $1,190, and in August 2015 and October 2015, the Company received additional milestone payments of $209 and $417 (net of South Korean withholding taxes), respectively.

As of June 30, 2016, the Company had unrestricted cash and cash equivalents and marketable securities of $84,764 and an accumulated deficit of $128,657. The Company has incurred substantial net losses and negative cash flows from operating activities in nearly every fiscal period since inception and expects this trend to continue for the foreseeable future. The Company recognized net losses of $23,766 and $10,373 and had net cash used in operating activities of $21,292 and $9,495 for the six months ended June 30, 2016 and 2015, respectively. The Company expects that cash and cash equivalents and marketable securities as of June 30, 2016 will be sufficient to fund its operations beyond one year.

The Company is subject to risks common to other life science companies including, but not limited to, uncertainty of product development and commercialization, lack of marketing and sales history, development by its competitors of new technological innovations, dependence on key personnel, market acceptance of products, product liability protection of proprietary technology, ability to raise additional financing, and compliance with Food and Drug Administration, or FDA, and other government regulations. If the Company does not successfully commercialize any of its product candidates, it will be unable to generate recurring product revenue or achieve profitability.

2. Basis of Presentation

The unaudited interim condensed financial statements included herein have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission, or the SEC. Accordingly, they do not include all information and disclosures necessary for a presentation of the Company’s financial position, results of operations and cash flows in conformity with generally accepted accounting principles in the United States of America, or GAAP. In the opinion of management, these unaudited interim financial statements reflect all adjustments, consisting primarily of normal recurring accruals, necessary for a fair presentation of results for the periods presented. The results of operations for interim periods are not necessarily indicative of the results for the full year. Certain information and footnote disclosures normally included in financial statements prepared in accordance with GAAP have been condensed or omitted from this report, as is permitted by SEC rules and regulations; however, the Company believes that the disclosures are adequate to make the information presented not misleading. The condensed balance sheet data for the year ended December 31, 2015 were derived from audited financial statements, but do not include all disclosures required by GAAP. These unaudited interim condensed financial statements should be read in conjunction with the audited financial statements and accompanying notes thereto included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2015.

5

CARA THERAPEUTICS, INC.

NOTES TO CONDENSED FINANCIAL STATEMENTS

(amounts in thousands, except share and per share data)

(unaudited)

Use of Estimates

The preparation of financial statements in conformity with GAAP requires the Company to make estimates and assumptions that affect the reported amounts of assets and liabilities, and disclosure of contingent assets and liabilities, as of the date of the financial statements as well as the reported amounts of revenues and expenses during the reporting period. Actual results could differ materially from the Company’s estimates and assumptions. Significant estimates include the fair value of marketable securities that are classified as level 2 of the fair value hierarchy, useful lives of fixed assets, the periods over which certain revenues will be recognized, including licensing and collaborative revenue recognized from non-refundable up-front and milestone payments, the determination of prepaid research and development, or R&D, clinical costs and accrued research projects, the amount of non-cash compensation costs related to share-based payments to employees and non-employees and the periods over which those costs are expensed and the likelihood of realization of deferred tax assets.

Significant Accounting Policies

There have been no material changes to the significant accounting policies previously disclosed in Note 2 to the Financial Statements in the Company’s Annual Report on Form 10-K for the year ended December 31, 2015.

Recent Accounting Pronouncements

In June 2016, the Financial Accounting Standards Board, or FASB, issued Accounting Standards Update, or ASU, No. 2016-13, Financial Instruments—Credit Losses (Topic 326) Measurement of Credit Losses on Financial Instruments, or ASU 2016-13, which replaces the incurred loss impairment methodology in current GAAP, that delays recognition of a credit loss until it is probable that such loss has been incurred, with a methodology that reflects expected credit losses and requires consideration of a broader range of reasonable and supportable information to inform credit loss estimates. ASU 2016-13 modifies the other-than-temporary impairment model for available-for-sale debt securities by requiring (1) estimating expected credit losses only when the fair value is below the amortized cost of the asset; (2) recording a credit loss without regard to the length of time a security has been in an unrealized loss position; (3) limiting the measurement of the credit loss to the difference between the security’s amortized cost basis and its fair value and (4) presenting credit losses as an allowance rather than as a write-down, which will allow the Company to record reversals of credit losses in current period net income, a practice that is currently prohibited. ASU 2016-13 will be effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. The Company is currently evaluating the effect that adoption of ASU 2016-13 will have on its results of operations, financial position and cash flows.

In May 2016, the FASB issued ASU No. 2016-12, Revenue from Contracts with Customers (Topic 606): Narrow-Scope Improvements and Practical Expedients, or ASU 2016-12, which amends guidance in the new revenue standard, ASU No. 2014-09 Revenue from Contracts with Customers (Topic 606), or ASU 2014-09, on collectability, noncash consideration, presentation of sales tax and transition. The amendments in ASU 2016-12 are effective for annual reporting periods beginning after December 15, 2017 (i.e., January 1, 2018), including interim periods within those reporting periods, which is the same as for ASU 2014-09, as amended by ASU No. 2015-14, Revenue from Contracts with Customers (Topic 606): Deferral of the Effective Date, or ASU 2015-14. The Company is currently evaluating the effect that adoption of ASU 2016-12 will have on its financial statements.

In April 2016, the FASB issued ASU No. 2016-10, Revenue from Contracts with Customers (Topic 606), Identifying Performance Obligations and Licensing, or ASU 2016-10, which clarifies the principle for determining whether a good or service is “separately identifiable” from other promises in the contract and, therefore, should be accounted for as a separate performance obligation. In that regard, ASU 2016-10 requires that an entity determine whether its promise is to transfer individual goods or services to the customer, or a combined item (or items) to which the individual goods and services are inputs. In addition, ASU 2016-10 categorizes intellectual property, or IP, into two categories: “functional” and “symbolic.” Functional IP has significant standalone functionality. All other IP is considered symbolic IP. Revenue from licenses of functional IP is generally recognized at a point in time, while revenue from licenses of symbolic IP is recognized over time. ASU 2016-10 has the same effective date and transition requirements as ASU 2014-09, as amended by ASU 2015-14. The Company is currently evaluating the effect that adoption of ASU 2016-10 will have on its financial statements.

6

CARA THERAPEUTICS, INC.

NOTES TO CONDENSED FINANCIAL STATEMENTS

(amounts in thousands, except share and per share data)

(unaudited)

In March 2016, the FASB issued ASU No. 2016-08, Revenue from Contracts with Customers (Topic 606), Principal versus Agent Considerations (Reporting Revenue Gross versus Net), or ASU 2016-08, which clarifies the implementation guidance on principal versus agent considerations contained in ASU 2014-09 by specifying that the determination as to whether an entity that is involved in providing a good or a service to a customer is a principal or an agent is based upon whether the entity controls the good or the service before it is transferred to the customer. ASU 2016-08 has the same effective date and transition requirements as ASU 2014-09, as amended by ASU 2015-14. The Company is currently evaluating the effect that adoption of ASU 2016-08 will have on its financial statements.

In March 2016, the FASB issued ASU No. 2016-09, Improvements to Employee Share-Based Payment Accounting, or ASU 2016-09, which amends Accounting Standards Codification, or ASC, Topic 718, Compensation – Stock Compensation. ASU 2016-09 simplifies several aspects of the accounting for share-based payment transactions, including the accounting for forfeitures, income tax consequences, classification of awards as either equity or liabilities, and classification on the statement of cash flows. ASU 2016-09 is effective for fiscal years beginning after December 15, 2016, and interim periods within those fiscal years and early adoption is permitted. Certain of the amendments will be applied using a modified retrospective transition method by means of a cumulative-effect adjustment to equity as of the beginning of the period in which ASU 2016-09 is adopted, while other amendments will be applied retrospectively, prospectively or using either a prospective or a retrospective transition method. Upon adoption on January 1, 2017, the Company will account for forfeitures as they occur rather than estimate a forfeiture rate and will record a cumulative-effect adjustment in equity on the date of initial adoption. In periods subsequent to adoption, a higher expense will be recognized related to stock-based awards that are not forfeited. The Company expects that the income tax amendments within ASU 2016-09 will have no impact on its results of operations or cash flows because it is in a net operating loss position with a full valuation allowance.

In May 2014, the FASB issued ASU 2014-09, which changes the principle under which the Company will recognize revenue from contracts with customers from one which requires the Company to satisfy specific criteria before recognizing revenue to one which requires the Company to recognize revenue in an amount that reflects the consideration to which it expects to be entitled in exchange for the transfer of promised goods or services to customers. ASU 2014-09, as amended by ASU 2015-14, is effective for annual reporting periods beginning after December 15, 2017 (i.e., January 1, 2018), including interim periods within those reporting periods. The standard allows for two transition methods: (1) retrospectively to each prior reporting period presented, or (2) using a modified retrospective approach, with the cumulative effect of initially applying ASU 2014-09 recognized as an adjustment to the opening balance of retained earnings at the date of initial adoption. The Company is currently in the process of deciding which method of transition it will use and the effect of adoption of ASU 2014-09 on its results of operations, financial position and cash flows. The Company currently recognizes revenue only from contracts with Maruishi and CKD, under both of which the Company may earn future milestone payments upon the achievement of defined clinical and regulatory events. The Company is continuing to monitor the timing of achievement of such milestones. To the extent that all defined milestones have not been achieved and the related revenue recognized under current GAAP prior to the adoption of ASU 2014-09, those contracts will be included within the scope of ASU 2014-09. However, since the current accounting for those contracts, as multiple element arrangements with milestone revenue recognized using the milestone method, is similar to ASU 2014-09, the Company does not expect a material effect on its financial statements from the adoption of ASU 2014-09.

3. Available-for-Sale Marketable Securities

As of June 30, 2016 and December 31, 2015, the Company’s available-for-sale marketable securities consisted of money market mutual funds and debt securities issued by the U.S. government and government-sponsored entities and by investment grade institutions.

7

CARA THERAPEUTICS, INC.

NOTES TO CONDENSED FINANCIAL STATEMENTS

(amounts in thousands, except share and per share data)

(unaudited)

The following tables summarize the Company’s available-for-sale marketable securities by major type of security as of June 30, 2016 and December 31, 2015:

As of June 30, 2016

			Gross Unrealized
Type of Security	Amortized Cost		Gains		Losses			Estimated Fair Value
Money market mutual funds	$	31,226	$	62	$	—		$	31,288
U.S. Treasury securities		2,503		2		—			2,505
Other U.S. government agency obligations		11,146		6		—			11,152
Corporate bonds		14,581		3		(5	)		14,579
Commercial paper		21,691		4		—			21,695
Total available-for-sale marketable securities	$	81,147	$	77	$	(5	)	$	81,219

As of December 31, 2015

			Gross Unrealized
Type of Security	Amortized Cost		Gains		Losses			Estimated Fair Value
Money market mutual funds	$	42,017	$	—	$	(31	)	$	41,986
U.S. Treasury securities		2,528		—		—			2,528
Other U.S. government agency obligations		13,492		4		—			13,496
Corporate bonds		14,194		—		(6	)		14,188
Commercial paper		19,444		1		(3	)		19,442
Total available-for-sale marketable securities	$	91,675	$	5	$	(40	)	$	91,640

All available-for-sale marketable securities are classified in the Company’s Condensed Balance Sheets as Marketable securities.

The Company classifies its marketable debt securities based on their contractual maturity dates. As of June 30, 2016, the Company’s marketable debt securities mature at various dates through May 2017. The fair values and amortized cost of marketable debt securities by contractual maturity were as follows. The table does not include money market funds that are classified as available-for-sale marketable securities.

	As of June 30, 2016				As of December 31, 2015
Contractual maturity	Fair Value		Amortized Cost		Fair Value		Amortized Cost
Less than one year	$	49,931	$	49,921	$	49,653	$	49,657

During the six months ended June 30, 2016, the Company sold shares of a money market mutual fund that were classified as available-for-sale marketable securities. There were no realized gains or losses from this transaction since the fair value of the shares sold of $10,900 was equal to the carrying value of those shares.

8

CARA THERAPEUTICS, INC.

NOTES TO CONDENSED FINANCIAL STATEMENTS

(amounts in thousands, except share and per share data)

(unaudited)

The following tables show the fair value of the Company’s available-for-sale marketable securities that have unrealized losses and that are deemed to be only temporarily impaired, aggregated by investment category and length of time that the individual investments have been in a continuous unrealized loss position.

	Less than 12 Months					12 Months or Greater				Total
As of June 30, 2016	Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses
Corporate bonds	$	11,055	$	(5	)	$	—	$	—	$	11,055	$	(5	)
Total	$	11,055	$	(5	)	$	—	$	—	$	11,055	$	(5	)
	Less than 12 Months					12 Months or Greater				Total
As of December 31, 2015	Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses
Money market mutual funds	$	30,985	$	(31	)	$	—	$	—	$	30,985	$	(31	)
Corporate bonds		14,187		(6	)		—		—		14,187		(6	)
Commercial paper		11,960		(3	)		—		—		11,960		(3	)
Total	$	57,132	$	(40	)	$	—	$	—	$	57,132	$	(40	)

As of June 30, 2016 and December 31, 2015, the Company held a total of 13 out of 38 positions and 15 out of 23 positions, respectively, that were in an unrealized loss position, none of which had been in an unrealized loss position for 12 months or greater. Based on the Company’s review of these securities, the Company believes that the cost basis of its available-for-sale marketable securities is recoverable and that, therefore, it had no other-than-temporary impairments on these securities as of June 30, 2016 and December 31, 2015. The Company does not intend to sell these debt securities and the Company believes it is not more likely than not that it will be required to sell these securities before the recovery of their amortized cost basis, which may be maturity.

4. Accumulated Other Comprehensive Income (Loss)

The following table summarizes the changes in accumulated other comprehensive income (loss), or AOCI, net of tax, from unrealized gains (losses) on available-for-sale marketable securities, the Company’s only component of AOCI, for the six months ended June 30, 2016. For the six months ended June 30, 2015, all of the Company’s funds were held in money market savings and checking accounts that were classified as cash equivalents and not as available-for-sale marketable securities. For the six months ended June 30, 2016, there were no reclassifications from AOCI since there were no sales of available-for-sale marketable securities with realized gains or losses.

9

CARA THERAPEUTICS, INC.

NOTES TO CONDENSED FINANCIAL STATEMENTS

(amounts in thousands, except share and per share data)

(unaudited)

	Total Accumulated Other Comprehensive Income (Loss)
Balance, December 31, 2015	$	(35	)
Other comprehensive income before reclassifications		76
Amount reclassified from accumulated other comprehensive income		—
Net current period other comprehensive income		76
Balance, June 30, 2016	$	41

5. Fair Value Measurements

As of June 30, 2016 and December 31, 2015, the Company’s financial instruments consist of cash and cash equivalents, available-for-sale marketable securities, restricted cash, accounts payable and accrued liabilities. The fair values of cash and cash equivalents, restricted cash, accounts payable and accrued liabilities approximate their carrying values due to the short-term nature of these financial instruments. Marketable securities are reported on the Company’s Condensed Balance Sheets at their fair values, based upon pricing of securities with the same or similar investment characteristics as provided by third-party pricing services, as described below.

Current accounting guidance defines fair value, establishes a framework for measuring fair value in accordance with ASC section 820, and requires certain disclosures about fair value measurements. The valuation techniques included in the guidance are based on observable and unobservable inputs. Observable inputs reflect readily obtainable data from independent sources, while unobservable inputs reflect the Company’s assumptions about the inputs that market participants would use in pricing the asset or liability and are developed based on the best information available in the circumstances.

The Company classifies its investments in a fair value hierarchy that is intended to increase consistency and comparability in fair value measurements and related disclosures. The fair value hierarchy is divided into three levels based on the source of inputs as follows:

• Level 1 – Observable inputs – quoted prices in active markets for identical assets and liabilities.

• Level 2 – Observable inputs other than the quoted prices in active markets for identical assets and liabilities – such as quoted prices for similar instruments, quoted prices for identical or similar instruments in inactive markets, or other inputs that are observable or can be corroborated by observable market data.

• Level 3 – Unobservable inputs – includes amounts derived from valuation models where one or more significant inputs are unobservable and require the Company to develop relevant assumptions.

Valuation Techniques - Level 2 Inputs

The Company estimates the fair values of its financial instruments categorized as level 2 in the fair value hierarchy, including U.S. Treasury securities, other U.S. government agency obligations, corporate bonds, commercial paper and money market funds with similar underlying investments, by taking into consideration valuations obtained from third-party pricing services. The pricing services use 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. These inputs include reported trades of and broker/dealer quotes on the same or similar securities, benchmark yields, issuer credit spreads, benchmark securities, and other observable inputs. The Company obtains a single price for each financial instrument and does not adjust the prices obtained from the pricing service.

The Company validates the prices provided by its third party pricing services by reviewing their pricing methods, obtaining market values from other pricing sources and comparing them to the share prices presented by the pricing service. After completing its validation procedures, the Company did not adjust or override any fair value measurements provided by its pricing services as of June 30, 2016 or December 31, 2015.

10

CARA THERAPEUTICS, INC.

NOTES TO CONDENSED FINANCIAL STATEMENTS

(amounts in thousands, except share and per share data)

(unaudited)

The following tables summarize the Company’s financial assets measured at fair value on a recurring basis as of June 30, 2016 and December 31, 2015.

Fair value measurement as of June 30, 2016

Financial assets	Total		Quoted prices in active markets for identical assets (Level 1)		Significant other observable inputs (Level 2)		Significant unobservable inputs (Level 3)
Type of Instrument
Cash and cash equivalents:
Money market mutual funds, savings account and checking accounts	$	3,545	$	3,545	$	—	$	—
Available-for-sale marketable securities:
Money market mutual funds		31,288		—		31,288		—
U.S. Treasury securities		2,505		—		2,505		—
Other U.S. government agency obligations		11,152		—		11,152		—
Corporate bonds		14,579		—		14,579		—
Commercial paper		21,695		—		21,695		—
Restricted cash:
Commercial money market account		1,469		1,469		—		—
Total financial assets	$	86,233	$	5,014	$	81,219	$	—

Fair value measurement as of December 31, 2015:

Financial assets	Total		Quoted prices in active markets for identical assets (Level 1)		Significant other observable inputs (Level 2)		Significant unobservable inputs (Level 3)
Type of Instrument
Cash and cash equivalents:
Money market mutual funds, savings account and checking accounts	$	15,101	$	15,101	$	—	$	—
Available-for-sale marketable securities:
Money market mutual funds		41,986				41,986		—
U.S. Treasury securities		2,528				2,528		—
Other U.S. government agency obligations		13,496				13,496		—
Corporate bonds		14,188				14,188		—
Commercial paper		19,442				19,442		—
Restricted cash:
Bank Certificate of Deposit		700		700		—		—
Total financial assets	$	107,441	$	15,801	$	91,640	$	—

11

CARA THERAPEUTICS, INC.

NOTES TO CONDENSED FINANCIAL STATEMENTS

(amounts in thousands, except share and per share data)

(unaudited)

There were no purchases, sales or maturities of Level 3 financial assets and no unrealized gains or losses related to Level 3 available-for-sale marketable securities for the six months ended June 30, 2016. There were no transfers of financial assets between Levels 1, 2, or 3 classifications during the six months ended June 30, 2016.

6. Restricted Cash

The Company is required to maintain stand-by letters of credit as security deposits under each of its leases, one for its operating facility in Shelton, Connecticut and the other for its office space in Stamford, Connecticut (refer to Note 12, Commitments and Contingencies). The fair value of each letter of credit approximates its contract value. In each case, the Company’s bank requires the Company to maintain restricted cash balances to serve as collateral for the letter of credit issued to the respective landlords by the bank. As of June 30, 2016, the restricted cash balances for the Shelton lease and the Stamford lease were both invested in a commercial money market account.

The restricted cash balance for the Shelton lease remains at $700 through the end of the lease term in 2017. For the Stamford lease, the letter of credit balance remains at $769 for the first three years following commencement of the Stamford lease and may, upon request from the Company, thereafter be reduced to $408 through the end of the lease term in 2023. The reduction in the balance of the letter of credit for the Stamford lease is contingent upon the Company not being in default of any provisions of that lease prior to request for the reduction. As of June 30, 2016 and December 31, 2015, the Company had $1,469 and $700 of restricted cash, respectively, in long-term assets.

7. Prepaid expenses

As of June 30, 2016, prepaid expenses were $3,398, consisting of $2,874 of prepaid R&D clinical costs, $460 of prepaid insurance and $64 of other prepaid costs. As of December 31, 2015, prepaid expenses were $1,729 consisting of $1,500 of prepaid R&D clinical costs, $98 of prepaid insurance, $96 of prepaid rent, and $35 of other prepaid costs.

8. Accounts Payable and Accrued Expenses

Accounts payable and accrued expenses consist of the following:

	June 30, 2016		December 31, 2015
Accounts payable	$	2,931	$	1,965
Accrued research projects		2,779		1,542
Accrued Shelton lease liability		1,232		—
Accrued professional fees		342		371
Accrued compensation and benefits		835		1,204
Accrued other		49		186
Total	$	8,168	$	5,268

9. Net Loss Per Share

The Company computes basic net income (loss) per share by dividing net income (loss) by the weighted average number of shares of common stock outstanding. Diluted net income per share includes the potential dilutive effect of common stock equivalents as if such securities were exercised during the period, when the effect is dilutive. Common stock equivalents may include outstanding stock options, which are included using the treasury stock method when dilutive. For the three and six months ended June 30, 2016 and 2015, the Company excluded the effects of potentially dilutive shares that were outstanding during those respective periods from the denominator as their inclusion would be anti-dilutive due to the Company’s net losses during those periods.

12

CARA THERAPEUTICS, INC.

NOTES TO CONDENSED FINANCIAL STATEMENTS

(amounts in thousands, except share and per share data)

(unaudited)

The denominators used in the net loss per share computations are as follows:

	Three Months Ended June 30,				Six Months Ended June 30,
	2016		2015		2016		2015
Basic:
Weighted average common shares outstanding		27,282,863		22,828,612		27,271,226		22,818,601
Diluted:
Weighted average common shares outstanding - Basic		27,282,863		22,828,612		27,271,226		22,818,601
Common stock options*		—		—		—		—
Denominator for diluted net loss per share		27,282,863		22,828,612		27,271,226		22,818,601

* No amounts were considered as their effects would be anti-dilutive.

Basic and diluted net loss per share are computed as follows:

	Three Months Ended June 30,						Six Months Ended June 30,
	2016			2015			2016			2015
Net loss	$	(13,075	)	$	(5,684	)	$	(23,766	)	$	(10,373	)
Weighted-average common shares outstanding:
Basic and Diluted		27,282,863			22,828,612			27,271,226			22,818,601
Net loss per share, Basic and Diluted	$	(0.48	)	$	(0.25	)	$	(0.87	)	$	(0.45	)

As of June 30, 2016 and 2015, 2,256,700 and 1,583,480 stock options, respectively, were outstanding, which could potentially dilute basic earnings per share in the future, but were not included in the computation of diluted net loss per share because to do so would have been anti-dilutive.

10. Stock-Based Compensation

2014 Equity Incentive Plan

The Company’s 2014 Equity Incentive Plan, or the 2014 Plan, is administered by the Company’s Board of Directors or a duly authorized committee thereof, referred to as the Plan administrator. The 2014 Plan provides for the grant of incentive stock options, non-statutory stock options, restricted stock awards, restricted stock unit awards, stock appreciation rights, performance stock awards and other forms of equity compensation, collectively referred to as Stock Awards. Additionally, the 2014 Plan provides for the grant of performance cash awards. Incentive stock options may be granted only to employees. All other awards may be granted to employees, including officers, non-employee directors, and consultants. No incentive stock options may be granted under the 2014 Plan after the tenth anniversary of the effective date of the 2014 Plan. Stock Awards granted under the 2014 Plan vest at the rate specified by the Plan administrator, which, for employees and non-employee consultants, has generally been 25% on the first anniversary of the date of grant and the balance ratably over the next 36 months. As of January 1, 2016, subsequent grants of Stock Awards made to employees vest monthly over a period of four years from the grant date. Stock options initially granted to members of the Company’s Board of Directors vest on the date of the Annual Meeting of Stockholders at which their initial term expires based on the class of Director. Subsequent grants to Directors that are made automatically at Annual Meetings of Stockholders vest fully on the first anniversary of the date of grant. The Plan administrator determines the term of Stock Awards granted under the 2014 Plan up to a maximum of ten years.

13

CARA THERAPEUTICS, INC.

NOTES TO CONDENSED FINANCIAL STATEMENTS

(amounts in thousands, except share and per share data)

(unaudited)

The aggregate number of shares of the Company’s common stock reserved for issuance under the 2014 Plan will automatically increase on January 1 of each year, beginning on January 1, 2015 and continuing through and including January 1, 2024, by 3% of the total number of shares of the Company’s capital stock outstanding on December 31 of the preceding calendar year, or a lesser number of shares determined by the Company’s Board of Directors. On January 1, 2016, the aggregate number of shares of common stock that may be issued pursuant to stock awards under the 2014 Plan automatically increased from 2,284,061 to 3,101,707. The maximum number of shares that may be issued pursuant to the exercise of incentive stock options under the 2014 Plan is 30,000,000 shares.

Under the 2014 Plan, the Company granted 112,000 and 722,000 stock options during the three and six months ended June 30, 2016, respectively, and 309,000 and 604,000 stock options during the three and six months ended June 30, 2015, respectively. The fair values of stock options granted during the three and six months ended June 30, 2016 and 2015 were estimated as of the dates of grant using the Black-Scholes option pricing model with the following assumptions:

	Three Months Ended June 30,		Six Months Ended June 30,
	2016	2015	2016	2015
Risk-free interest rate	1.23% - 1.79%	1.87% - 1.89%	1.23% - 1.79%	1.43% - 1.89%
Expected volatility	69.3% - 72.6%	64%	67.8% - 72.6%	64% - 67%
Expected dividend yield	0%	0%	0%	0%
Expected life of employee options (in years)	6.25	6.25	6.25	6.25
Expected life of nonemployee options (in years)	10	10	10	10

The weighted average grant date fair value of options granted to employees and members of the Company’s Board of Directors for their service during the three and six months ended June 30, 2016 was $3.55 and $3.80, respectively, and during the three and six months ended June 30, 2015 was $6.41 and $6.32, respectively.

The weighted average fair value of outstanding options that had been granted to nonemployee consultants, as re-measured during the vesting period of each tranche in accordance with ASC 505-50, was $2.82 and $3.26 during the three and six months ended June 30, 2016, respectively, and $8.99 and $8.11 during the three and six months ended June 30, 2015, respectively.

14

CARA THERAPEUTICS, INC.

NOTES TO CONDENSED FINANCIAL STATEMENTS

(amounts in thousands, except share and per share data)

(unaudited)

During the three and six months ended June 30, 2016 and 2015, the Company recognized compensation expense relating to stock options, as follows:

	Three Months Ended June 30,				Six Months Ended June 30,
	2016		2015		2016		2015
Research and development	$	303	$	280	$	492	$	478
General and administrative		394		420		702		668
Total stock option expense	$	697	$	700	$	1,194	$	1,146

A summary of stock option award activity related to employees, non-employee members of the Company’s Board of Directors and non-employee consultants as of and for the six months ended June 30, 2016 is presented below:

	Number of Shares			Weighted Average Exercise Price
Outstanding, December 31, 2015		1,658,408		$	10.27
Granted		722,000			5.98
Exercised		(28,000	)		1.41
Forfeited		(94,792	)		12.22
Expired		(916	)		11.00
Outstanding, June 30, 2016		2,256,700			8.92
Options exercisable, June 30, 2016		810,712		$	8.95

The Company does not expect to realize any tax benefits from its stock option activity or the recognition of stock-based compensation expense because the Company currently has net operating losses and has a full valuation allowance against its deferred tax assets. Accordingly, no amounts related to excess tax benefits have been reported in cash flows from operations or cash flows from financing activities for the six months ended June 30, 2016 and 2015.

11. Income Taxes

For the three months ended June 30, 2016 and 2015, pre-tax losses were $13,154 and $5,719, respectively, and for the six months ended June 30, 2016 and 2015, pre-tax losses were $23,990 and $10,423, respectively. The Company recognized a full tax valuation allowance against its deferred tax assets as of June 30, 2016 and December 31, 2015.

The benefit from income taxes of $79 and $35 for the three months ended June 30, 2016 and 2015, respectively, and $224 and $50 for the six months ended June 30, 2016 and 2015, respectively, relates to state R&D tax credits exchanged for cash pursuant to the Connecticut R&D Tax Credit Exchange Program, which permits qualified small businesses engaged in R&D activities within Connecticut to exchange their unused R&D tax credits for a cash amount equal to 65% of the value of the exchanged credits.

15

CARA THERAPEUTICS, INC.

NOTES TO CONDENSED FINANCIAL STATEMENTS

(amounts in thousands, except share and per share data)

(unaudited)

12. Commitments and Contingencies

Contractual obligations and commitments as of June 30, 2016 were as follows:

	Payment Due for the Year Ending December 31,
	2016		2017		2018		2019		2020		Thereafter		Total
Stamford operating lease	$	192	$	875	$	1,093	$	1,217	$	1,241	$	3,650	$	8,268
Shelton operating lease		459		740		—		—		—		—		1,199
	$	651	$	1,615	$	1,093	$	1,217	$	1,241	$	3,650	$	9,467

In May 2016, the Company moved its headquarters to Stamford, Connecticut, where it leases office space under an operating lease with a term through October 2023 (See Note 21 of Notes to Financial Statements, Commitments and Contingencies, in the Company’s Annual Report on Form 10-K for the year ended December 31, 2015). As of June 30, 2016, the Stamford landlord had made renovations of approximately $1,094 to the leased premises. Such amount is included in Property and equipment, net and Deferred lease obligation on the Company’s Condensed Balance Sheet. Deferred lease obligation is being amortized as a reduction to rent expense over the same term as rent expense.

As of June 30, 2016, the Company continues to lease its former operating facility located in Shelton, Connecticut, which has a term through October 2017 (See Note 21 of Notes to Financial Statements, Commitments and Contingencies, in the Company’s Annual Report on Form 10-K for the year ended December 31, 2015). The Company accelerated the amortization of the Shelton leasehold improvements through May 2016, the date the Company moved from the Shelton facility, or cease-use date, at which time the net book value of those leasehold improvements was zero. Acceleration of amortization of the Shelton leasehold improvements resulted in $359 and $899 of additional amortization expense (additional net loss per share of $0.01 and $0.03) for the three and six months ended June 30, 2016, respectively.

In addition, in accordance with the accounting guidance in ASC 420-10-25-13 regarding exit or disposal cost obligations, as of May 2016, the Company recorded rent expense, within Research and development expense and General and administrative expense, and accrued a liability of $1,312, which represents the fair value of costs that will continue to be incurred during the remaining term of the Shelton operating lease without economic benefit to the Company. Such liability, which includes the $1,199 of minimum rental payments in the table above together with common area maintenance charges, is included in Accounts payable and accrued expenses on the Company’s Condensed Balance Sheet as of June 30, 2016. At the cease-use date, the Company also wrote off the balance of Deferred lease obligation of $429 related to the Shelton lease.

A reconciliation of the balances of the accrued Shelton lease cease-use liability from May 31, 2016 to June 30, 2016 is as follows:

Balance May 31, 2016	$	1,312
Rental payment, June 2016		(80	)
Balance June 30, 2016	$	1,232

16

Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations.

Cautionary Note Regarding Forward-Looking Statements

This Quarterly Report on Form 10-Q contains forward-looking statements, within the meaning of the U.S. Private Securities Litigation Reform Act of 1995, that involve substantial risks and uncertainties. In some cases, you can identify forward-looking statements by the words “anticipate,” “believe,” “continue,” “could,” “estimate,” “expect,” “intend,” “may,” “might,” “objective,” “ongoing,” “plan,” “predict,” “project,” “potential,” “should,” “will,” or “would,” and or the negative of these terms, or other comparable terminology intended to identify statements about the future. These statements involve known and unknown risks, uncertainties and other factors that may cause our actual results, levels of activity, performance or achievements to be materially different from the information expressed or implied by these forward-looking statements. Although we believe that we have a reasonable basis for each forward-looking statement contained in this Quarterly Report on Form 10-Q, we caution you that these statements are based on a combination of facts and factors currently known by us and our expectations of the future, about which we cannot be certain.

The forward-looking statements in this Quarterly Report on Form 10-Q include, among other things, statements about:

• the success and timing of our clinical trials, including our clinical trial programs for I.V. CR845 in acute pain and uremic pruritus and Oral CR845 in acute and chronic pain, and the reporting of clinical trial results;

• our plans to develop and commercialize I.V. CR845 and our other product candidates, including Oral CR845;

• the potential results of ongoing and planned preclinical studies and clinical trials and future regulatory and development milestones for our product candidates;

• our ability to obtain and maintain regulatory approval of our product candidates, including I.V. and Oral CR845, and the labeling under any approval we may obtain;

• the anticipated commercial launch of our lead product candidate, I.V. CR845;

• the potential of future scheduling of I.V. CR845 by the United States Drug Enforcement Administration, or DEA, if regulatory approval is received;

• the performance of our current and future collaborators, including Maruishi Pharmaceuticals Co. Ltd, or Maruishi, and Chong Kun Dang Pharmaceutical Corp., or CKD, and our ability to maintain such collaborations;

• our ability to establish additional collaborations for our product candidates;

• the continued service of our key scientific or management personnel;

• our ability to establish commercialization and marketing capabilities;

• the rate and degree of market acceptance of any approved products;

• our ability to obtain and maintain coverage and adequate reimbursement from third-party payers for any approved products;

• our planned use of our cash and cash equivalents and marketable securities, including the net proceeds from our follow-on offering, and the clinical milestones we expect to fund with such proceeds;

• the accuracy of our estimates regarding expenses, future revenues and capital requirements;

• our ability to obtain funding for our operations;

• our ability to obtain and maintain intellectual property protection for our product candidates and our ability to operate our business without infringing on the intellectual property rights of others; and

• the performance of third-party manufacturers and clinical research organizations.

You should refer to Part I Item 1A. “Risk Factors” of our Annual Report on Form 10-K for the year ended December 31, 2015 for a discussion of important factors that may cause our actual results to differ materially from those expressed or implied by our forward-looking statements. As a result of these factors, we cannot assure you that the forward-looking statements in this Quarterly Report on Form 10-Q will prove to be accurate. Furthermore, if our forward-looking statements prove to be inaccurate, the inaccuracy may be material. In light of the significant uncertainties in these forward-looking statements, you should not regard these statements as a representation or warranty by us or any other person that we will achieve our objectives and plans in any specified time frame or at all. We undertake no obligation to publicly update any forward-looking statements, whether as a result of new information, future events or otherwise, except as required by law.

17

You should read this Quarterly Report on Form 10-Q and the documents that we reference in this Quarterly Report on Form 10-Q and have filed as exhibits to this Quarterly Report on Form 10-Q completely and with the understanding that our actual future results may be materially different from what we expect. We qualify all of our forward-looking statements by these cautionary statements.

The following Management’s Discussion and Analysis of Financial Condition and Results of Operations should be read in conjunction with: (i) the Condensed Financial Statements and related notes thereto which are included in this Quarterly Report on Form 10-Q; and (ii) our Annual Report on Form 10-K for the year ended December 31, 2015.

Overview

We are a clinical-stage biopharmaceutical company focused on developing and commercializing new chemical entities designed to alleviate pain and pruritus by selectively targeting peripheral kappa opioid receptors. We are developing a novel and proprietary class of product candidates that target the body’s peripheral nervous system.

We commenced operations in 2004, and our primary activities to date have been organizing and staffing our company, developing our product candidates, including conducting preclinical studies and clinical trials of CR845-based product candidates and raising capital. To date, we have financed our operations primarily through sales of our equity and debt securities and payments from license agreements. We have no products currently available for sale, and substantially all of our revenue to date has been revenue from license agreements, although we have received nominal amounts of revenue under research grants.

I.V. CR845 for Treatment of Acute Postoperative Pain

Our most advanced product candidate, I.V. CR845, demonstrated significant pain relief and a favorable safety and tolerability profile in three randomized, double-blind, placebo-controlled Phase 2 clinical trials in patients with acute postoperative pain, without inducing many of the undesirable side effects typically associated with currently available pain therapeutics. In addition, in the fourth quarter of 2014, we successfully completed a Human Abuse Liability, or HAL, trial of I.V. CR845 in which I.V. CR845 met the primary endpoint of demonstrating statistically significant lower “drug liking” scores as compared to the approved schedule IV opioid, pentazocine. We believe that the totality of results from the HAL trial are supportive of the potential for CR845 to be the first non-scheduled or low scheduled (Schedule V) peripheral opioid for acute pain.

In April 2015, we completed an End-of-Phase 2 meeting with the FDA to discuss the design of our pivotal trials for our I.V. CR845 product candidate in acute pain. In September 2015, we initiated our Phase 3 clinical trial program for I.V. CR845 in postoperative pain with the dosing of the first subjects in an adaptive pivotal trial in patients undergoing a range of abdominal surgeries. This trial is a multi-center, randomized, double-blind, placebo-controlled, parallel-group adaptive design trial with repeated doses of I.V. CR845 or placebo administered both prior to and following abdominal surgery in male and female patients. The trial protocol initially included three dose levels of I.V. CR845 (1.0, 2.0 and 5.0 ug/kg), which were compared to placebo with an interim conditional power assessment to identify optimal doses to be used to complete the enrollment of this trial.

In February 2016, the FDA advised us that our adaptive pivotal trial of I.V. CR845 for postoperative pain had been placed on IND clinical hold pending a safety review. The clinical hold was based on a pre-specified stopping rule related to elevated serum sodium levels of greater than 150 mmol/L that was included in the clinical trial protocol. Four patients out of 90 total patients that had been dosed at that time, all of whom were in the highest I.V. CR845 dose group (5.0 ug/kg), exhibited transient serum sodium levels equal to or greater than 150 mmol/L (mild-to-moderate hypernatremia). The most common adverse events (>5%) reported across treatment groups and placebo were nausea, hypernatremia, abdominal distension and procedural hypotension. All cases of abdominal distension and procedural hypotension were attributed to the surgical procedure and not to study drug. There were no cases of respiratory depression, no adverse events greater than Grade 1, and no CR845-associated serious adverse events have been reported.

A subsequent review of unblinded safety data from the first 90 patients dosed was completed by us, the trial’s Independent Data Monitoring Committee and the FDA. The results of this safety data review confirmed that increases in serum sodium levels in CR845-treated patients beyond the normal range were dose-dependent and asymptomatic with the lowest frequency of events found in the 1.0 ug/kg I.V. CR845 group.

In April 2016, we received notice from the FDA that it had removed the clinical hold on our adaptive Phase 3 trial of I.V. CR845 for postoperative pain. Based on the safety review and our analysis of interim efficacy signals for pain, supplemental opioid use and opioid-related side effects that we observed in the unblinded data from the adaptive pivotal trial of I.V. CR845, we modified the trial protocol and, in June 2016, resumed the trial as a three-arm trial, testing two doses of CR845 (1.0 ug/kg and 0.5 ug/kg)

18

versus placebo. The revised trial is enrolling up to 450 patients undergoing either hysterectomy, prostatectomy, hemi-colectomy or ventral hernia, all of which are associated with moderate-to-severe postoperative visceral pain, at approximately 30 clinical sites within the United States. The primary efficacy measure is the Change in Pain Intensity over the 24-hour postoperative period, or AUC, using the patient-reported Numeric Rating Scale, or NRS, score collected at pre-specified time points through 24 hours. Postoperative nausea and vomiting is also being evaluated as a secondary efficacy measure. The impact of I.V. CR845 treatment on inflammatory biomarkers is also being explored.

Based on previous guidance from the FDA, we believe we will require 1,500 total exposures to I.V. CR845, including all Phase 1, Phase 2 and Phase 3 trials, prior to submitting a new drug application, or NDA. We believe our planned clinical trials and our clinical trials completed to date will result in a sufficient number of drug exposures to support an NDA.

Oral CR845 for Treatment of Osteoarthritis

We are also developing an oral version of CR845, or Oral CR845, for acute and chronic pain. In August 2015, we advanced our tablet formulation of Oral CR845 into a Phase 2a clinical trial in patients with osteoarthritis, or OA, of the knee or hip. The Phase 2a trial was a single-blind, randomized, multiple ascending dose trial designed to evaluate the safety, pharmacokinetics, or PK, and effectiveness of oral CR845 tablets dosed over a two-week treatment period in OA patients experiencing moderate-to-severe pain, defined as >4 on an 11-point NRS at baseline. Patients discontinued current pain medications five days prior to baseline measurements. Four tablet strengths (0.25 mg, 0.5 mg, 1.0 mg and 5.0 mg) were administered twice a day over a two-week treatment period in a total of 80 OA patients enrolled at five sites in the United States. In addition to safety and PK observations, Oral CR845’s effectiveness was assessed by: change from baseline in joint pain using the NRS, which was measured daily, change from baseline in the Western Ontario and McMaster Osteoarthritis Index, which was measured at the end of Weeks 1 and 2 of treatment, change from baseline in rescue medication use, measured daily, and Patient Global Assessment, which was measured on the last day of the trial. Acetaminophen was the only allowable rescue medication. PK analyses indicated dose-proportional exposure of CR845 after oral administration, with the 5.0 mg dose group exhibiting an approximately five-fold increased mean AUC value compared to the 1.0 mg dose group.

In December 2015, we announced positive top-line results from this Phase 2a trial. The results showed a dose-related reduction in mean baseline pain score up to 34% after two weeks, with statistically significant reduction in mean rescue medication for the top 5.0 mg dose group of approximately 80 percent (ANOVA: p= 0.02, for 5.0 mg vs lower dose groups). The effectiveness of the 5.0 mg dose was further supported by statistically significant, dose-related increases in the proportion of patients whose OA was “very much improved” or “much improved” as indicated by patient global assessment (Cochran-Mantel-Haenszel test, p=0.02, 2-sided). In this trial, all four tablet strengths were observed to be safe and well tolerated.

The Phase 2a trial establishes therapeutic doses and a dosing regimen for a larger double-blind, placebo-controlled Phase 2b trial, which we plan to initiate during the third quarter of 2016. The Phase 2b trial will be a double-blind, multiple-dose trial with twice-daily doses of CR845 administered over an eight-week treatment period in osteoarthritis patients with moderate-to-severe pain. The trial will include 330 patients randomized across three CR845 tablet strengths and a placebo arm at 15 sites across the United States.

I.V. CR845 for Treatment of Uremic (Chronic Kidney Disease-Associated) Pruritus

CR845 has exhibited anti-pruritic, or anti-itch, potency in standard preclinical models. In July 2015, we reported positive top-line efficacy results from a Phase 2 proof-of-concept trial of I.V. CR845 for the treatment of uremic pruritus, a systemic condition with high prevalence in dialysis patients, for which there are no approved therapeutics in the United States. We observed that I.V. CR845 demonstrated statistically significant results on the primary endpoint of reducing worst itch intensity as well as the secondary endpoint of quality of life improvements. We also observed I.V. CR845 to have a favorable safety and tolerability profile in the trial.

Based on the results of this trial, during the fourth quarter of 2015 we completed a guidance meeting with the FDA. We have incorporated the feedback we received from the FDA in this guidance meeting in the overall design of our Phase 3 clinical trial program for I.V. CR845 for the treatment of uremic pruritus.

In June 2016, we initiated a two-part Phase 2/3 adaptive design trial of I.V. CR845 in dialysis patients suffering from moderate-to-severe uremic pruritus, an intractable systemic itch condition in patients with chronic kidney disease. Part A of the trial, is a randomized, double-blind, placebo-controlled trial in 160 patients of three doses of I.V. CR845 (0.5ug/kg, 1.0 ug/kg and 1.5 ug/kg) administered three times per week after dialysis over an 8-week period. Part B will be a randomized double-blind placebo-controlled trial in up to 240 patients of one optimized dose of I.V. CR845 administered three times per week after dialysis over a 12-week treatment period. The primary endpoint will be reduction in worst itching scores from baseline values measured on a standard NRS alongside secondary quantitative quality of life endpoints.

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We will also initiate a pharmacokinetic safety trial of multiple doses of Oral CR845 in hemodialysis patients to define bioequivalent tablet strengths to inform our ability to develop an oral tablet formulation for moderate-to-severe uremic pruritus.

Components of Operating Results

Revenue

To date, we have not generated any revenue from product sales and do not expect to generate any revenue from the sale of products in the near future. Substantially all of our revenue recognized to date has been generated by upfront payments under license agreements with Maruishi and CKD for CR845, a portion of which was deferred upon receipt, as well as license agreements for CR665, our first generation drug program for which development efforts have ceased. To date, we have earned a total of $3.5 million in clinical development or regulatory milestone payments, net of contractual foreign currency adjustments and South Korean withholding taxes, but have not received any royalties, under these collaborations.

Research and Development (R&D)

To date, our R&D expenses have related primarily to the development of CR845. R&D expenses consist of expenses incurred in performing R&D activities, including compensation and benefits for full-time R&D employees, facilities expenses, including laboratory build-out costs, overhead expenses, cost of laboratory supplies, clinical trial and related clinical manufacturing expenses, third-party formulation expenses, fees paid to contract research organizations, or CROs, and other consultants, stock-based compensation for R&D employees and non-employee consultants and other outside expenses. Our R&D expenses also include expenses related to preclinical activities, such as drug discovery, target validation and lead optimization for CR845 and our other, earlier stage programs.

R&D costs are expensed as incurred. Non-refundable advance payments for goods or services to be received in the future for use in R&D activities are deferred and capitalized. The capitalized amounts are expensed as the related goods are delivered or the services are performed. Most of our R&D costs have been external costs, which we track on a program-by program basis. Our internal R&D costs are primarily compensation expenses for our full-time R&D employees. We do not track internal R&D costs on a program-by-program basis.

R&D activities are central to our business model. Product candidates in later stages of clinical development generally have higher development costs than those in earlier stages of clinical development, primarily due to the increased size and duration of later-stage clinical trials. We expect our R&D expenses to increase significantly over the next several years as we seek to progress I.V. CR845 through Phase 3 trials and the FDA approval process. However, it is difficult to determine with certainty the duration and completion costs of our current or future preclinical programs and clinical trials of our product candidates, or if, when or to what extent we will generate revenues from the commercialization and sale of any of our product candidates that obtain regulatory approval. We may never succeed in achieving regulatory approval for any of our product candidates.

The duration, costs and timing of clinical trials and development of our product candidates will depend on a variety of factors including:

• per patient trial costs;

• the number of patients that participate in the trials;

• the number of sites included in the trials;

• the countries in which the trial is conducted;

• the length of time required to enroll eligible patients;

• the number of doses that patients receive;

• the drop-out or discontinuation rates of patients;

• potential additional safety monitoring or other studies requested by regulatory agencies;

• the duration of patient follow-up; and

• the efficacy and safety profile of the product candidate.

In addition, the probability of success for each product candidate will depend on numerous factors, including: competition, manufacturing capability and commercial viability. We will determine which programs to pursue and how much to fund each program in response to the scientific and clinical success of each product candidate, as well as an assessment of each product candidate’s commercial potential.

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General and Administrative

General and administrative expenses consist primarily of salaries and other related costs, including stock-based compensation, for personnel in executive, finance, accounting, business development and human resources functions. Other significant costs include facility costs not otherwise included in R&D expenses, legal fees, insurance costs, patent costs and fees for accounting and consulting services.

We anticipate that our general and administrative expenses will increase in the future to support our continued R&D activities and potential commercialization of our product candidates. These increases will likely include increased costs related to the hiring of additional personnel, fees to outside consultants, lawyers and accountants, and investor relations costs. In addition, if I.V. CR845 or any future product candidate obtains regulatory approval for marketing, we expect to incur expenses associated with building a sales and marketing team.

Other Income

Other income consists of interest income earned on our cash, cash equivalents, marketable securities and restricted cash and realized gains and losses on the sale of marketable securities.

Benefit from Income Taxes

The benefit from income taxes relates to state R&D tax credits exchanged for cash pursuant to the Connecticut R&D Tax Credit Exchange Program, which permits qualified small businesses engaged in R&D activities within Connecticut to exchange their unused R&D tax credits for a cash amount equal to 65% of the value of the exchanged credits.

Results of Operations

Comparison of the Three and Six Months Ended June 30, 2016 and 2015

Revenue

	Three Months Ended June 30,					Six Months Ended June 30,
	2016		2015		% change	2016		2015		% change
	Amounts in thousands					Amounts in thousands
Collaborative revenue	$	—	$	874	-100%	$	—	$	1,363	-100%
Clinical compound revenue		79		—	100%		86		—	100%
Total revenue	$	79	$	874	-91%	$	86	$	1,363	-94%

Collaborative revenue for the three months ended June 30, 2015 of $874 thousand and for the six months ended June 30, 2015 of $1.4 million consists of revenue that had been deferred upon entry into the license agreement with Maruishi.

Clinical compound revenue for the three and six months ended June 30, 2016 of $79 thousand and $86 thousand, respectively, resulted from the sale of clinical compound to Maruishi.

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Research and Development Expense

	Three Months Ended June 30,					Six Months Ended June 30,
	2016		2015		% change	2016		2015		% change
	Amounts in thousands					Amounts in thousands
Direct preclinical studies and clinical trial costs	$	7,294	$	2,981	145%	$	12,996	$	4,808	170%
Consultant services in support of preclinical studies and clinical trials		523		193	171%		1,148		355	224%
Stock-based compensation		303		280	8%		492		478	3%
Depreciation and amortization		279		104	169%		663		208	219%
Other R&D operating expenses		2,361		1,126	110%		4,006		2,220	80%
Total R&D expense	$	10,760	$	4,684	130%	$	19,305	$	8,069	139%

For the three months ended June 30, 2016 compared to the three months ended June 30, 2015, the net increase in direct preclinical studies and clinical trial costs and related consultant costs primarily resulted from increases totaling $2.9 million, primarily for the Phase 3 I.V. CR845 adaptive pivotal clinical trial and the Phase 2/3 I.V. CR845 clinical trial in patients with uremic pruritus, coupled with a net increase of $1.9 million of CR845 drug manufacturing costs. Those costs were partially offset by decreases totaling $1.7 million in clinical trial costs primarily in connection with the Phase 2a I.V. CR845 proof-of-concept trial in patients with uremic pruritus, the I.V. CR845 HAL trial and the Phase 2a Oral CR845 clinical trial in patients with OA, which was completed in 2015. There was also a net increase of $1.5 million of preclinical costs. The increase in depreciation and amortization expense reflects the acceleration of amortization of the leasehold improvements at our Shelton, Connecticut facility related to research and development activities prior to the relocation of our corporate headquarters. The increase in other R&D operating expenses was primarily the result of an increase in payroll and related costs associated with R&D personnel and an increase in rent, which includes recognition of all of the remaining rent expense allocable to research and development activities due during the remaining term of the Shelton operating lease (See Note 12 of Notes to Condensed Financial Statements in this Quarterly Report on Form 10-Q).

For the six months ended June 30, 2016 compared to the six months ended June 30, 2015, the net increase in direct preclinical studies and clinical trial costs and related consultant costs primarily resulted from increases totaling $4.5 million for the Phase 3 I.V. CR845 adaptive pivotal clinical trial and the Phase 2/3 I.V. CR845 clinical trial in patients with uremic pruritus, coupled with a net increase of $4.1 million of CR845 drug manufacturing costs. Those costs were partially offset by decreases totaling $2.1 million in clinical trial costs primarily in connection with the Phase 2a I.V. CR845 proof-of-concept trial in patients with uremic pruritus, the I.V. CR845 HAL trial and the Phase 2a Oral CR845 clinical trial in patients with OA, which was completed in 2015. There was also a net increase of $2.4 million of preclinical costs. The increase in depreciation and amortization expense reflects the acceleration of amortization of the leasehold improvements at our Shelton, Connecticut facility related to research and development activities prior to the relocation of our corporate headquarters (See Note 12 of Notes to Condensed Financial Statements in this Quarterly Report on Form 10-Q). The increase in other R&D operating expenses was primarily the result of an increase in payroll and related costs associated with R&D personnel and rent, which includes recognition of all of the remaining rent expense allocable to research and development activities due during the remaining term of the Shelton operating lease (See Note 12 of Notes to Condensed Financial Statements in this Quarterly Report on Form 10-Q).

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The following table summarizes our R&D expenses by product candidate for the three and six months ended June 30, 2016 and 2015:

	Three Months Ended June 30,				Six Months Ended June 30,
	2016		2015		2016		2015
	Amounts in thousands				Amounts in thousands
External research and development expenses:
I.V. CR845	$	3,946	$	2,577	$	8,733	$	4,322
Oral CR845		3,871		597		5,411		841
Internal research and development expenses		2,943		1,510		5,161		2,906
Total research and development expenses	$	10,760	$	4,684	$	19,305	$	8,069

General and Administrative Expenses

	Three Months Ended June 30,					Six Months Ended June 30,
	2016		2015		% change	2016		2015		% change
	Amounts in thousands					Amounts in thousands
Professional fees and public/investor relations	$	503	$	493	2%	$	1,075	$	969	11%
Stock-based compensation		394		420	-6%		702		668	5%
Depreciation and amortization		240		89	168%		586		179	228%
Other G&A operating expenses		1,508		920	64%		2,729		1,928	41%
Total G&A expense	$	2,645	$	1,922	38%	$	5,092	$	3,744	36%

For the three months ended June 30, 2016 compared to the three months ended June 30, 2015, the increase in depreciation and amortization expense reflects the acceleration of amortization of our leasehold improvements at our Shelton, Connecticut facility related to general and administrative activities prior to the relocation of our corporate headquarters (See Note 12 of Notes to Condensed Financial Statements in this Quarterly Report on Form 10-Q). The increase in other G&A operating expenses included increases in payroll and related costs and in franchise taxes and rent, which includes recognition of all of the remaining rent expense allocable to general and administrative activities due during the remaining term of the Shelton operating lease (See Note 12 of Notes to Condensed Financial Statements in this Quarterly Report on Form 10-Q).

For the six months ended June 30, 2016 compared to the six months ended June 30, 2015, the increase in professional fees and public/investor relations costs primarily included increases in public/investor relations costs and in accounting and auditing fees. The increase in depreciation and amortization expense reflects the acceleration of amortization of our leasehold improvements at our Shelton, Connecticut facility related to general and administrative activities prior to the relocation of our corporate headquarters (See Note 12 of Notes to Condensed Financial Statements in this Quarterly Report on Form 10-Q). The increase in other G&A operating expenses included increases in payroll and related costs and in franchise taxes and rent, which includes recognition of all of the remaining rent expense allocable to general and administrative activities due during the remaining term of the Shelton operating lease (See Note 12 of Notes to Condensed Financial Statements in this Quarterly Report on Form 10-Q).

Other Income

	Three Months Ended June 30,					Six Months Ended June 30,
	2016		2015		% change	2016		2015		% change
	Amounts in thousands					Amounts in thousands
Other Income	$	172	$	13	1223%	$	321	$	27	1073%

During the three months ended June 30, 2016 compared to the three months ended June 30, 2015, and during the six months ended June 30, 2016 compared to the six months ended June 30, 2015, the respective increases in other income were primarily due to an increase in interest income and dividends earned on our portfolio of investments, which included marketable securities during the 2016 periods but not during the 2015 periods. In addition, the increase in other income was due to higher interest rates on a higher average balance of cash and cash equivalents and marketable securities in 2016 as a result of our follow-on offering of common stock, which closed in August 2015.

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Benefit from Income Taxes

For the three months ended June 30, 2016 and 2015, pre-tax losses were $13.2 million and $5.7 million, respectively, and we recognized a benefit from income taxes of $79 thousand and $35 thousand, respectively.

For the six months ended June 30, 2016 and 2015, pre-tax losses were $24.0 million and $10.4 million, respectively, and we recognized a benefit from income taxes of $224 thousand and $50 thousand, respectively.

The benefit from income taxes relates to state R&D tax credits exchanged for cash pursuant to the Connecticut R&D Tax Credit Exchange Program, as discussed above. We recognized a full valuation allowance against deferred tax assets at June 30, 2016 and December 31, 2015.

Liquidity and Capital Resources

Sources of Liquidity

Since our inception and through June 30, 2016, we have raised an aggregate of approximately $237.5 million to fund our operations, including (1) proceeds of $75.2 million, net of underwriting discounts and commissions and offering expenses paid by us, from our follow-on offering of our common stock, which closed in August 2015; (2) proceeds of $56.3 million, net of underwriting discounts and commissions and offering expenses paid by us, from our initial public offering, or IPO, which closed in February 2014; (3) $32.5 million under our license agreements, primarily with Maruishi and CKD, and an earlier product candidate for which development efforts ceased in 2007; (4) $65.9 million of proceeds from the sale of shares of our convertible preferred stock prior to our IPO and (5) $7.4 million of net proceeds from debt financings. As of June 30, 2016, we had $84.8 million in unrestricted cash and cash equivalents and available-for-sale marketable securities, which we believe will be sufficient to fund our planned operating expenses and capital expenditure requirements through the end of the first quarter of 2018, without giving effect to any potential milestone payments we may receive under our collaboration agreements with Maruishi and CKD.

In order to fund future operations, including our planned clinical trials, we filed a shelf registration statement on Form S-3 (File No. 333-203072), which the Securities and Exchange Commission, or SEC, declared effective on May 13, 2015. This shelf registration statement provides for aggregate offerings of up to $150 million of common stock, preferred stock, debt securities, warrants or any combination thereof. On August 4, 2015, we completed a follow-on public offering of 4,327,956 shares of our common stock, including 564,516 shares sold pursuant to the full exercise by the underwriters of their option to buy additional shares, pursuant to this shelf registration statement and a related prospectus supplement dated July 29, 2015, filed with the SEC on July 30, 2015. We received gross proceeds from the offering of approximately $80.5 million, or net proceeds of $75.2 million after deducting the underwriting discounts and commissions and offering expenses paid by us. We may offer additional securities under this shelf registration statement from time to time in response to market conditions or other circumstances if we believe such a plan of financing is in the best interests of our stockholders. We believe that this shelf registration statement provides us with the flexibility to raise additional capital to finance our operations as needed.

In addition, under the Maruishi License Agreement, or Maruishi Agreement, we are potentially eligible to earn up to an aggregate of $6.0 million in clinical development milestones and $4.5 million in regulatory milestones, before any foreign exchange adjustment, as well as tiered royalties, with percentages ranging from the low double digits to the low twenties, based on net sales of products containing CR845 in Japan, if any, and share in any sub-license fees. During 2014 and 2015, we earned a total of $2.2 million, net of contractual foreign currency exchange adjustments of $0.3 million, related to two milestones involving clinical trials in Japan of CR845 in acute post-operative pain and for the treatment of uremic pruritus.

The next potential milestone payment that we could be entitled to receive under the Maruishi Agreement will be for a clinical development milestone for completion by us in the United States of the first Phase 3 pivotal trial of CR845 in acute pain. If achieved, this milestone will result in a payment of $1.0 million, before any foreign exchange adjustment, being due to us.

Under the CKD License Agreement, or CKD Agreement, we are potentially eligible to earn up to an aggregate of $2.25 million in clinical development milestones and $1.5 million in regulatory milestones, before South Korean withholding tax, as well as tiered royalties with percentages ranging from the high single digits to the high teens, based on net sales of products containing CR845 in South Korea, if any, and share in any sub-license fees. During 2012 and 2015, we earned a total of $1.25 million, net of South Korean withholding tax of $0.25 million, related to three milestones involving clinical trials in the United States of CR845 in acute post-operative pain and for the treatment of uremic pruritus.

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The next potential milestone payment that we could be entitled to receive under the CKD Agreement will be for a clinical development milestone for completion of a Phase 3 trial of CR845 in the United States for the treatment of uremic pruritus. If achieved, this milestone will result in a payment $750 thousand, before South Korean withholding tax, being due to us.

Our ability to earn these payments and their timing is dependent upon the outcome of I.V. and Oral CR845 development activities and, potentially, commercialization. However, our receipt of any further such amounts is uncertain at this time and we may never receive any more of these amounts.

Funding Requirements

Our primary uses of capital have been, and we expect will continue to be, compensation and related expenses, third-party clinical R&D services, laboratory and related supplies, clinical costs, legal and other regulatory expenses and general overhead costs. See Part II Item 2, Unregistered Sales of Equity Securities and Use of Proceeds, below, regarding the use of the net proceeds from our IPO.

Since inception, we have incurred significant operating and net losses. Our net losses were $23.8 million and $10.4 million for the six months ended June 30, 2016 and 2015, respectively. As of June 30, 2016, we had an accumulated deficit of $128.7 million. We expect to continue to incur significant expenses and operating and net losses over at least the next several years. Our net losses may fluctuate significantly from quarter to quarter and year to year, depending on the timing of our clinical trials, the receipt of additional milestone payments, if any, under our collaborations with Maruishi and CKD, the receipt of payments under any future collaborations we may enter into, and our expenditures on other R&D activities.

We anticipate that our expenses will increase substantially as we:

• continue our I.V. CR845 pivotal clinical trial program in acute pain;

• continue the development of our I.V. CR845 uremic pruritus product candidate;

• continue the R&D of our Oral CR845 and other product candidates;

• seek regulatory approvals for I.V. CR845 and any product candidates that successfully complete clinical trials;

• establish a sales, marketing and distribution infrastructure and scale up external manufacturing capabilities to commercialize any products for which we may obtain regulatory approval;

• maintain, expand and protect our global intellectual property portfolio;

• hire additional clinical, quality control and scientific personnel; and

• add operational, financial and management information systems and personnel, including personnel to support our drug development and potential future commercialization efforts.

The successful development of any of our product candidates is highly uncertain. As such, at this time, we cannot reasonably estimate or know the nature, timing and costs of the efforts that will be necessary to complete the development of I.V. CR845, Oral CR845 or our other current and future product candidates. We are also unable to predict when, if ever, we will generate any further material net cash inflows from CR845. This is due to the numerous risks and uncertainties associated with developing medicines, including the uncertainty of:

• successful enrollment in, and completion of clinical trials;

• receipt of marketing approvals from applicable regulatory authorities;

• establishing commercial manufacturing capabilities or making arrangements with third-party manufacturers;

• obtaining and maintaining patent and trade secret protection and regulatory exclusivity for our product candidates;

• launching commercial sales of the products, if and when approved, whether alone or in collaboration with others;

• achieving meaningful penetration in the markets which we seek to serve; and

• obtaining adequate coverage or reimbursement by third parties, such as commercial payers and government healthcare programs, including Medicare and Medicaid.

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A change in the outcome of any of these variables with respect to the development of I.V. CR845, Oral CR845 or any of our future product candidates would significantly change the costs and timing associated with the development of that product candidate.

Because our product candidates are still in clinical and preclinical development and the outcome of these efforts is uncertain, we cannot estimate the actual amounts necessary to successfully complete the development and commercialization of our product candidates or whether, or when, we may achieve profitability. Until such time, if ever, as we can generate substantial product revenues, we expect to finance our cash needs through a combination of equity or debt financings and collaboration arrangements, including our existing collaboration agreements with Maruishi and CKD.

We will require additional capital beyond our current balances of cash and cash equivalents and available-for-sale marketable securities and anticipated amounts as described above, and this additional capital may not be available when needed, on reasonable terms, or at all. In particular, because we do not have sufficient financial resources to meet all of our development objectives, especially the completion of our planned development of Oral CR845 and I.V. CR845 in uremic pruritus, we will need to raise additional capital. If we are not able to do so, we could be required to postpone, scale back or eliminate some, or all, of these objectives. To the extent that we raise additional capital through the future sale of equity or convertible debt, the ownership interest of our stockholders will be diluted, and the terms of these securities may include liquidation or other preferences that adversely affect the rights of our existing common stockholders. If we raise additional funds through the issuance of debt securities, these securities could contain covenants that would restrict our operations. If we raise additional funds through collaboration arrangements in the future, we may have to relinquish valuable rights to our technologies, future revenue streams or product candidates or grant licenses on terms that may not be favorable to us. If we are unable to raise additional funds through equity or debt financings when needed, we may be required to delay, limit, reduce or terminate our drug development or future commercialization efforts or grant rights to develop and market product candidates that we would otherwise prefer to develop and market ourselves.

Outlook

Based on timing expectations and projected costs for our current clinical development plans, which include:

(1) completing required trials for I.V. CR845 in postoperative pain to enable an NDA submission;

(2) completing a Phase 2b trial of Oral CR845 in chronic pain; and

(3) advancing our CR845 uremic pruritus program through a Phase 2/3 adaptive pivotal trial

we expect that our existing cash and cash equivalents and available-for-sale marketable securities as of June 30, 2016 will be sufficient for us to fund our operating expenses and capital expenditure requirements through the end of the first quarter of 2018, without giving effect to any potential milestone payments we may receive under our collaboration agreements with Maruishi and CKD. Because the process of testing product candidates in clinical trials is costly and the timing of progress in these trials is uncertain, it is possible that the assumptions upon which we have based this estimate may prove to be wrong, and we could use our capital resources sooner than we presently expect.

Cash Flows

The following is a summary of the net cash flows provided by (used in) our operating, investing and financing activities for the six months ended June 30, 2016 and 2015:

	Six Months Ended June 30,
	2016			2015
Net cash used in operating activities	$	(21,292	)	$	(9,495	)
Net cash provided by (used in) investing activities		9,696			(12	)
Net cash provided by financing activities		40			35
Net decrease in cash and cash equivalents	$	(11,556	)	$	(9,472	)

Net cash used in operating activities

Net cash used in operating activities for the six months ended June 30, 2016 consisted primarily of a net loss of $23.8 million partially offset by a $0.6 million cash inflow from net changes in operating assets and liabilities and a $1.9 million cash inflow from net non-cash charges. The net change in operating assets and liabilities primarily consisted of a cash inflow of $2.6 million from an increase in accounts payable and accrued expenses, partially offset by cash outflows of $1.7 million from an increase in prepaid

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expense, primarily related to increases in prepaid clinical costs and prepaid insurance, and of $0.4 million due to an increase in income tax receivable from the State of Connecticut under the Connecticut R&D Tax Credit Exchange Program, an increase in a receivable from the Stamford landlord for leasehold improvements and an increase in interest receivable on our portfolio of marketable securities. Net non-cash charges primarily consisted of depreciation and amortization expense of $1.2 million, stock-based compensation expense of $1.2 million and deferred rent costs of $0.4 million.

Net cash used in operating activities for the six months ended June 30, 2015 consisted primarily of a net loss of $10.4 million and a $0.5 million outflow from net changes in operating assets and liabilities, partially offset by $1.4 million cash inflow from net non-cash charges. The net change in operating assets and liabilities primarily consisted of cash outflows of $0.3 million from an increase in prepaid expenses and other current assets, primarily related to an increase in prepaid insurance, and $1.4 million from a decrease in deferred revenue from the Maruishi license transaction. Those cash outflows were partially offset by a cash inflow of $1.2 million from an increase in accounts payable and accrued expenses. Net non-cash charges primarily consisted of depreciation and amortization expense of $0.4 million and stock-based compensation expense of $1.1 million, partially offset by deferred rent costs of $0.1 million.

Net cash provided by (used in) investing activities

Net cash provided by investing activities was $9.7 million for the six months ended June 30, 2016, which primarily included cash inflows of $42.4 million from maturities of available-for-sale marketable securities and $10.9 million from the sale of available-for-sale marketable securities. Those cash inflows were partially offset by cash outflows of $42.7 million from the purchase of available-for-sale marketable securities, $0.2 million of cash paid for purchase of property and equipment at our new corporate headquarters in Stamford, Connecticut and $0.8 million of additional restricted cash related to our Stamford lease.

Net cash used in investing activities was $12 thousand for the six months ended June 30, 2015 related to the purchase of office and computer equipment.

Net cash provided by financing activities

Net cash provided by financing activities for the six months ended June 30, 2016 and 2015 consisted primarily of proceeds of $40 thousand and $35 thousand, respectively, received from the exercise of stock options.

Significant Contractual Obligations and Commitments

Contractual obligations and commitments as of June 30, 2016 consisted of operating lease obligations in connection with our facilities in Shelton, Connecticut and Stamford, Connecticut. See Note 12 of Notes to Condensed Financial Statements in this Quarterly Report on Form 10-Q.

Recent Accounting Pronouncements

Please refer to Note 2 of Notes to Condensed Financial Statements in this Quarterly Report on Form 10-Q.

Off-Balance Sheet Arrangements

We did not have during the periods presented in our condensed financial statements included in this report, and we do not currently have, any off-balance sheet arrangements, as defined under SEC rules.

Discussion of Critical Accounting Policies

The preparation of financial statements in conformity with GAAP requires us to use judgment in making certain estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities and the reported amounts of revenues and expenses in our condensed financial statements and accompanying notes. Critical accounting policies are those that are most important to the portrayal of our financial condition and results of operations and require difficult, subjective and complex judgments by management in order to make estimates about the effect of matters that are inherently uncertain. During the six months ended June 30, 2016, there were no significant changes to our critical accounting policies from those described in our Annual Report on Form 10-K for the year ended December 31, 2015.

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Item 3. Quantitative and Qualitative Disclosures About Market Risk.

Interest Rate Risk

As of June 30, 2016, we invested a majority of our cash reserves in a variety of available-for-sale marketable securities, including money market funds and investment-grade debt instruments, principally corporate notes, commercial paper and direct obligations of the U.S. government and government-sponsored entities, and in cash equivalents. See Note 3 of Notes to Condensed Financial Statements in this Quarterly Report on Form 10-Q for details about our available-for-sale marketable securities.

Information about our market risks are disclosed in Part II, Item 7A, Quantitative and Qualitative Disclosures About Market Risk, of our Annual Report on Form 10-K for the fiscal year ended December 31, 2015. There have been no material changes to our market risks as of June 30, 2016.

We maintain an investment portfolio in accordance with our investment policy, which includes guidelines on acceptable investment securities, minimum credit quality, maturity parameters, and concentration and diversification. The primary objectives of our investment policy are to preserve principal, maintain proper liquidity and to meet operating needs. Our investments are subject to interest rate risk and will decrease in value if market interest rates increase. However, due to the conservative nature of our investments and relatively short duration, interest rate risk is mitigated. As of June 30, 2016, if interest rates were to increase or decrease by 10%, the decrease (increase) in the fair value of our investment portfolio would be immaterial. We do not currently use interest rate derivative instruments to manage exposure to interest rate changes.

Credit Quality Risk

Although our investments are subject to credit risk, our investment policy specifies credit quality standards for our investments and limits the amount of credit exposure from any single issue, issuer or type of investment. Nonetheless, deterioration of the credit quality of an investment security subsequent to purchase may subject us to the risk of not being able to recover the full principal value of the security.

Item 4. Controls and Procedures.

(a) Disclosure Controls and Procedures.

Our management, with the participation of our Chief Executive Officer and Chief Financial Officer, has evaluated the effectiveness of our disclosure controls and procedures (as such term is defined in Rules 13a-15(e) and 15d-15(e) under the Exchange Act) as of June 30, 2016. Management recognizes that any controls and procedures, no matter how well designed and operated, can provide only reasonable assurance of achieving their objectives and management necessarily applies its judgment in evaluating the cost benefit relationship of possible controls and procedures. Based on such evaluation, our Chief Executive Officer and Chief Financial Officer have concluded that, as of June 30, 2016, our disclosure controls and procedures were effective.

(b) Changes in Internal Control Over Financial Reporting

There was no change in our internal control over financial reporting identified in connection with the evaluation required by Rule 13a-15(f) and 15d-15(f) of the Exchange Act that occurred during the quarter ended June 30, 2016 that has materially affected, or is reasonably likely to materially affect, our internal control over financial reporting.

28

PART II

OTHER INFORMATION

Item 1. Legal Proceedings

From time to time, we are subject to litigation and claims arising in the ordinary course of business. We are not currently a party to any material legal proceedings and we are not aware of any pending or threatened legal proceedings against us that we believe could have a material adverse effect on our business, operating results or financial condition.

Item 1A. Risk Factors.

Please refer to Item 1A. Risk Factors in our Annual Report on Form 10-K for the year ended December 31, 2015, filed with the SEC on March 10, 2016, for a description of certain significant risks and uncertainties to which our business, operations and financial condition are subject. During the six months ended June 30, 2016, we did not identify any additional risk factors or any material changes to the risk factors discussed in the Annual Report on Form 10-K for the year ended December 31, 2015.

Item 2. Unregistered Sales of Equity Securities and Use of Proceeds.

Use of IPO Proceeds

On January 30, 2014, our registration statement on Form S-1 (File No 333-192230) was declared effective by the SEC for our initial public offering, pursuant to which we registered the offering and sale of 5,750,000 shares of common stock, $0.001 par value per share (including 750,000 shares issued upon the underwriters’ exercise of an option to purchase additional shares) at a public offering price of $11.00 per share for an aggregate public offering price of $63.2 million.

As a result of the initial public offering, we received net proceeds on February 5, 2014 of approximately $58.8 million, after deducting approximately $4.4 million of underwriting discounts and commissions but before giving effect to any offering expenses borne by us. In addition, we have paid approximately an additional $2.5 million of offering expenses in connection with the IPO. None of such payments were direct or indirect payments to any of (i) our directors or officers or their associates, (ii) persons owning 10 percent or more of our common stock, or (iii) our affiliates.

There has been no material change in the planned use of proceeds from our initial public offering from that described in the final prospectus related to the offering, which we filed with the SEC on February 3, 2014. As of June 30, 2016, we have used approximately $38.5 million of the funds received from our IPO for clinical trials and payments to R&D consultants.

Item 3. Defaults upon Senior Securities.

None.

Item 4. Mine Safety Disclosures.

Not applicable.

Item 5. Other Information.

None.

29

Item 6. Exhibits.

Exhibit No.	Description of Exhibit
3.1	Amended and Restated Certificate of Incorporation (1)
3.2	Amended and Restated Bylaws (2)
10.1 +	Eleventh Amendment to Services Agreement dated July 2, 2004 between the Registrant and Bio Diligence Partners, Inc. (3)
31.1	Certification of Chief Executive Officer of Cara Therapeutics, Inc. pursuant to Rule 13a-14(a)/15d-14(a) of the Securities Exchange Act of 1934.
31.2	Certification of Chief Financial Officer of Cara Therapeutics, Inc. pursuant to Rule 13a-14(a)/15d-14(a) of the Securities Exchange Act of 1934.
32.1*	Certifications of Chief Executive Officer and Chief Financial Officer of Cara Therapeutics, Inc. pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
101	Interactive Data File
101.CAL	XBRL Taxonomy Extension Calculation Linkbase.
101.INS	XBRL Instance Document.
101.LAB	XBRL Taxonomy Extension Label Linkbase.
101.PRE	XBRL Taxonomy Extension Presentation Linkbase.
101.SCH	XBRL Taxonomy Extension Schema Linkbase.
101.DEF	XBRL Definition Linkbase Document.

+ Indicates management contract or compensatory plan.

(1) Filed as exhibit 3.1 to the Registrant’s Current Report on Form 8-K (File No. 001-36279) filed with the Securities and Exchange Commission on February 7, 2014 and incorporated herein by reference.

(2) Filed as exhibit 3.2 to the Registrant’s Current Report on Form 8-K (File No. 001-36279) filed with the Securities and Exchange Commission on February 7, 2014 and incorporated herein by reference.

(3) The Services Agreement, as previously amended, was filed as exhibit 10.1 to the Registrant’s Quarterly Report on Form 10-Q (File No. 001-36279) filed with the Securities and Exchange Commission on August 10, 2015 and incorporated herein by reference.

* These certifications are being furnished solely to accompany this quarterly report pursuant to 18 U.S.C. Section 1350, and are not being filed for purposes of Section 18 of the Securities Exchange Act of 1934 and are not to be incorporated by reference into any filing of the registrant, whether made before or after the date hereof, regardless of any general incorporation language in such filing.

30

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

	CARA THERAPEUTICS, INC.
Date: August 4, 2016	By	/s/ Derek Chalmers
		Derek Chalmers, Ph.D., D.Sc.
		President and Chief Executive Officer
		(Principal Executive Officer)
Date: August 4, 2016	By	/s/ Josef Schoell
		Josef Schoell
		Chief Financial Officer
		(Principal Financial and Accounting Officer)

31

EX-10.1

Exhibit 10.1

June 30, 2016

Michael Lewis, Ph.D.

Bio Diligence Partners Inc.

This letter shall serve as an eleventh amendment to the Services Agreement dated July 2, 2004. It is hereby agreed to extend the Agreement from July 1, 2016 to July 1, 2017. Compensation described in Exhibit A of the Agreement, as previously amended, will continue at the rate of $157,500.00 per annum and paid on a monthly basis. The reimbursement for 70% of the health insurance cost for consultant shall continue, paid quarterly.

All other sections of the Agreement continue as written.

Cara Therapeutics, Inc.
By:	/s/ Derek Chalmers
Name:	Derek Chalmers, Ph.D., D.Sc.
Title:	President & CEO
Bio Diligence Partners, Inc.
By:	/s/ Michael Lewis
Name:	Michael Lewis, Ph.D.
Title:	President

EX-31.1

EXHIBIT 31.1

Certification of Chief Executive Officer Pursuant to

Rule 13a-14(a) under the Securities Exchange Act

of 1934, as Adopted Pursuant to

Section 302 of the Sarbanes-Oxley Act of 2002

I, Derek Chalmers, certify that:

1. I have reviewed this Quarterly Report on Form 10-Q of Cara Therapeutics, Inc.;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: August 4, 2016	By:	/s/ Derek Chalmers, Ph.D., D.Sc.
		DEREK CHALMERS
		CHIEF EXECUTIVE OFFICER

EX-31.2

EXHIBIT 31.2

Certification of Chief Financial Officer Pursuant to

Rule 13a-14(a) under the Securities Exchange Act

of 1934, as Adopted Pursuant to

Section 302 of the Sarbanes-Oxley Act of 2002

I, Josef Schoell, certify that:

1. I have reviewed this Quarterly Report on Form 10-Q of Cara Therapeutics, Inc.;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: August 4, 2016	By:	/s/ Josef Schoell
		JOSEF SCHOELL
		CHIEF FINANCIAL OFFICER

EX-32.1

EXHIBIT 32.1

CERTIFICATIONS OF

CHIEF EXECUTIVE OFFICER AND CHIEF FINANCIAL OFFICER

OF CARA THERAPEUTICS, INC.

PURSUANT TO 18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO SECTION 906 OF THE

SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report on Form 10-Q of Cara Therapeutics, Inc. (the “Company”) for the quarter ended June 30, 2016, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), Derek Chalmers, Ph.D., D.Sc., as Chief Executive Officer of the Company, and Josef Schoell, as Chief Financial Officer of the Company, each hereby certifies, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that, to the best of his knowledge, based upon a review of the Report:

(1) The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

/s/ DEREK CHALMERS

Name: Derek Chalmers, Ph.D., D.Sc.

Title: Chief Executive Officer

Date: August 4, 2016

/s/ JOSEF SCHOELL

Name: Josef Schoell

Title: Chief Financial Officer

Date: August 4, 2016

XML

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2016	Jul. 29, 2016
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2016
Document Fiscal Year Focus	2016
Document Fiscal Period Focus	Q2
Trading Symbol	CARA
Entity Registrant Name	Cara Therapeutics, Inc.
Entity Central Index Key	0001346830
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		27,282,863

XML

Condensed Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 3,545	$ 15,101
Marketable securities	81,219	91,640
Income tax receivable	608	384
Other receivables	373	80
Prepaid expenses	3,398	1,729
Total current assets	89,143	108,934
Property and equipment, net	1,433	1,263
Restricted cash	1,469	700
Total assets	92,045	110,897
Current liabilities:
Accounts payable and accrued expenses	8,168	5,268
Total current liabilities	8,168	5,268
Deferred lease obligation	1,289	585
Commitments and contingencies (Note 12)
Stockholders' equity:
Preferred stock; $0.001 par value; 5,000,000 shares authorized at June 30, 2016 and December 31, 2015, zero shares issued and outstanding at June 30, 2016 and December 31, 2015.
Common stock; $0.001 par value; 100,000,000 shares authorized at June 30, 2016 and December 31, 2015, 27,282,863 shares and 27,254,863 shares issued and outstanding at June 30, 2016 and December 31, 2015, respectively	27	27
Additional paid-in capital	211,177	209,943
Accumulated deficit	(128,657)	(104,891)
Accumulated other comprehensive income (loss)	41	(35)
Total stockholders' equity	82,588	105,044
Total liabilities and stockholders' equity	$ 92,045	$ 110,897

XML

Condensed Balance Sheets (Parenthetical) - $ / shares	Jun. 30, 2016	Dec. 31, 2015
Statement of Financial Position [Abstract]
Preferred stock, par value	$ 0.001	$ 0.001
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	27,282,863	27,254,863
Common stock, shares outstanding	27,282,863	27,254,863

XML

Condensed Statements of Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Revenue:
Collaborative revenue		$ 874		$ 1,363
Clinical compound revenue	$ 79		$ 86
Total revenue	79	874	86	1,363
Operating expenses:
Research and development	10,760	4,684	19,305	8,069
General and administrative	2,645	1,922	5,092	3,744
Total operating expenses	13,405	6,606	24,397	11,813
Operating loss	(13,326)	(5,732)	(24,311)	(10,450)
Other income	172	13	321	27
Loss before benefit from income taxes	(13,154)	(5,719)	(23,990)	(10,423)
Benefit from income taxes	79	35	224	50
Net loss	$ (13,075)	$ (5,684)	$ (23,766)	$ (10,373)
Net loss per share -Basic and Diluted	$ (0.48)	$ (0.25)	$ (0.87)	$ (0.45)
Weighted average shares:
Basic and Diluted	27,282,863	22,828,612	27,271,226	22,818,601
Other comprehensive income, net of tax of $0:
Unrealized gains on available-for-sale marketable securities	$ 37		$ 76
Total comprehensive loss	$ (13,038)	$ (5,684)	$ (23,690)	$ (10,373)

XML

Condensed Statements of Comprehensive Loss (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Income Statement [Abstract]
Other comprehensive income, tax	$ 0	$ 0	$ 0	$ 0

XML

Condensed Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Balance, Value at Dec. 31, 2014	$ 51,662	$ 23	$ 131,840	$ (80,201)
Balance, Shares at Dec. 31, 2014		22,802,039
Stock-based compensation expense	1,146		1,146
Shares issued upon exercise of stock options, Value	35		35
Shares issued upon exercise of stock options, Shares		34,880
Net loss	(10,373)			(10,373)
Balance, Value at Jun. 30, 2015	42,470	$ 23	133,021	(90,574)
Balance, Shares at Jun. 30, 2015		22,836,919
Balance, Value at Dec. 31, 2015	105,044	$ 27	209,943	(104,891)	$ (35)
Balance, Shares at Dec. 31, 2015		27,254,863
Stock-based compensation expense	1,194		1,194
Shares issued upon exercise of stock options, Value	40		40
Shares issued upon exercise of stock options, Shares		28,000
Net loss	(23,766)			(23,766)
Other comprehensive income	76				76
Balance, Value at Jun. 30, 2016	$ 82,588	$ 27	$ 211,177	$ (128,657)	$ 41
Balance, Shares at Jun. 30, 2016		27,282,863

XML

Condensed Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Operating activities
Net loss	$ (23,766)	$ (10,373)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation expense	1,194	1,146
Depreciation and amortization	1,249	386
Accretion/amortization on available-for-sale marketable securities	(126)
Deferred rent costs	(395)	(142)
Changes in operating assets and liabilities:
Income tax receivable	(224)	(50)
Other receivables	(171)
Prepaid expenses	(1,669)	(303)
Accounts payable and accrued expenses	2,616	1,204
Deferred revenue		(1,363)
Net cash used in operating activities	(21,292)	(9,495)
Investing activities
Proceeds from maturities of available-for-sale marketable securities	42,400
Proceeds from sale of available-for-sale marketable securities	10,900
Purchases of available-for-sale marketable securities	(42,677)
Change in restricted cash	(769)
Purchases of property and equipment	(158)	(12)
Net cash provided by (used in) investing activities	9,696	(12)
Financing activities
Proceeds from the exercise of stock options	40	35
Net cash provided by financing activities	40	35
Net cash decrease for the period	(11,556)	(9,472)
Cash and cash equivalents at beginning of period	15,101	52,663
Cash and cash equivalents at end of period	3,545	$ 43,191
Noncash investing and financing activities
Tenant improvements paid by landlord	$ 1,094

XML

Business

6 Months Ended

Jun. 30, 2016

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Business

1. Business

Cara Therapeutics, Inc. (the “Company”, “we”, “our” or “us”) is a clinical-stage biopharmaceutical corporation formed on July 2, 2004. The Company is focused on developing and commercializing new chemical entities designed to alleviate pain and pruritus by selectively targeting peripheral kappa opioid receptors. The Company’s primary activities to date have been organizing and staffing the company, developing its product candidates, including conducting preclinical studies and clinical trials of CR845-based product candidates and raising capital.

As of June 30, 2016, the Company has raised aggregate net proceeds of approximately $204,800 from several rounds of equity financing, including its initial public offering, which closed in February 2014 and its follow-on offering, which closed in August 2015, and the issuance of debt. In addition, the Company received approximately $32,500 under its license agreements for CR845, primarily with Maruishi Pharmaceutical Co. Ltd., or Maruishi, and Chong Kun Dang Pharmaceutical Corp., or CKD, and an earlier product candidate for which development efforts ceased in 2007.

In connection with the license of rights to CR845 in Japan to Maruishi, and as part of the payments described above, in April 2013, the Company received an upfront payment of $15,000, and in August 2014 and September 2015, the Company received additional milestone payments of $480 and $1,725 (net of contractual foreign currency exchange adjustments), respectively. In connection with the license of rights to CR845 in South Korea to CKD, and as part of the payments described above, in 2012, the Company received aggregate upfront and milestone payments of $1,190, and in August 2015 and October 2015, the Company received additional milestone payments of $209 and $417 (net of South Korean withholding taxes), respectively.

As of June 30, 2016, the Company had unrestricted cash and cash equivalents and marketable securities of $84,764 and an accumulated deficit of $128,657. The Company has incurred substantial net losses and negative cash flows from operating activities in nearly every fiscal period since inception and expects this trend to continue for the foreseeable future. The Company recognized net losses of $23,766 and $10,373 and had net cash used in operating activities of $21,292 and $9,495 for the six months ended June 30, 2016 and 2015, respectively. The Company expects that cash and cash equivalents and marketable securities as of June 30, 2016 will be sufficient to fund its operations beyond one year.

The Company is subject to risks common to other life science companies including, but not limited to, uncertainty of product development and commercialization, lack of marketing and sales history, development by its competitors of new technological innovations, dependence on key personnel, market acceptance of products, product liability protection of proprietary technology, ability to raise additional financing, and compliance with Food and Drug Administration, or FDA, and other government regulations. If the Company does not successfully commercialize any of its product candidates, it will be unable to generate recurring product revenue or achieve profitability.

XML

Basis of Presentation

6 Months Ended

Jun. 30, 2016

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Basis of Presentation

2. Basis of Presentation

The unaudited interim condensed financial statements included herein have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission, or the SEC. Accordingly, they do not include all information and disclosures necessary for a presentation of the Company’s financial position, results of operations and cash flows in conformity with generally accepted accounting principles in the United States of America, or GAAP. In the opinion of management, these unaudited interim financial statements reflect all adjustments, consisting primarily of normal recurring accruals, necessary for a fair presentation of results for the periods presented. The results of operations for interim periods are not necessarily indicative of the results for the full year. Certain information and footnote disclosures normally included in financial statements prepared in accordance with GAAP have been condensed or omitted from this report, as is permitted by SEC rules and regulations; however, the Company believes that the disclosures are adequate to make the information presented not misleading. The condensed balance sheet data for the year ended December 31, 2015 were derived from audited financial statements, but do not include all disclosures required by GAAP. These unaudited interim condensed financial statements should be read in conjunction with the audited financial statements and accompanying notes thereto included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2015.

Use of Estimates

The preparation of financial statements in conformity with GAAP requires the Company to make estimates and assumptions that affect the reported amounts of assets and liabilities, and disclosure of contingent assets and liabilities, as of the date of the financial statements as well as the reported amounts of revenues and expenses during the reporting period. Actual results could differ materially from the Company’s estimates and assumptions. Significant estimates include the fair value of marketable securities that are classified as level 2 of the fair value hierarchy, useful lives of fixed assets, the periods over which certain revenues will be recognized, including licensing and collaborative revenue recognized from non-refundable up-front and milestone payments, the determination of prepaid research and development, or R&D, clinical costs and accrued research projects, the amount of non-cash compensation costs related to share-based payments to employees and non-employees and the periods over which those costs are expensed and the likelihood of realization of deferred tax assets.

Significant Accounting Policies

There have been no material changes to the significant accounting policies previously disclosed in Note 2 to the Financial Statements in the Company’s Annual Report on Form 10-K for the year ended December 31, 2015.

Recent Accounting Pronouncements

In June 2016, the Financial Accounting Standards Board, or FASB, issued Accounting Standards Update, or ASU, No. 2016-13, Financial Instruments—Credit Losses (Topic 326) Measurement of Credit Losses on Financial Instruments, or ASU 2016-13, which replaces the incurred loss impairment methodology in current GAAP, that delays recognition of a credit loss until it is probable that such loss has been incurred, with a methodology that reflects expected credit losses and requires consideration of a broader range of reasonable and supportable information to inform credit loss estimates. ASU 2016-13 modifies the other-than-temporary impairment model for available-for-sale debt securities by requiring (1) estimating expected credit losses only when the fair value is below the amortized cost of the asset; (2) recording a credit loss without regard to the length of time a security has been in an unrealized loss position; (3) limiting the measurement of the credit loss to the difference between the security’s amortized cost basis and its fair value and (4) presenting credit losses as an allowance rather than as a write-down, which will allow the Company to record reversals of credit losses in current period net income, a practice that is currently prohibited. ASU 2016-13 will be effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. The Company is currently evaluating the effect that adoption of ASU 2016-13 will have on its results of operations, financial position and cash flows.

In May 2016, the FASB, issued ASU No. 2016-12, Revenue from Contracts with Customers (Topic 606): Narrow-Scope Improvements and Practical Expedients, or ASU 2016-12, which amends guidance in the new revenue standard, ASU No. 2014-09Revenue from Contracts with Customers (Topic 606), or ASU 2014-09, on collectability, noncash consideration, presentation of sales tax and transition. The amendments in ASU 2016-12 are effective for annual reporting periods beginning after December 15, 2017 (i.e., January 1, 2018), including interim periods within those reporting periods, which is the same as for ASU 2014-09, as amended by ASU No. 2015-14, Revenue from Contracts with Customers (Topic 606): Deferral of the Effective Date, or ASU 2015-14. The Company is currently evaluating the effect that adoption of ASU 2016-12 will have on its financial statements.

In April 2016, the FASB issued ASU No. 2016-10, Revenue from Contracts with Customers (Topic 606), Identifying Performance Obligations and Licensing, or ASU 2016-10, which clarifies the principle for determining whether a good or service is “separately identifiable” from other promises in the contract and, therefore, should be accounted for as a separate performance obligation. In that regard, ASU 2016-10 requires that an entity determine whether its promise is to transfer individual goods or services to the customer, or a combined item (or items) to which the individual goods and services are inputs. In addition, ASU 2016-10 categorizes intellectual property, or IP, into two categories: “functional” and “symbolic.” Functional IP has significant standalone functionality. All other IP is considered symbolic IP. Revenue from licenses of functional IP is generally recognized at a point in time, while revenue from licenses of symbolic IP is recognized over time. ASU 2016-10 has the same effective date and transition requirements as ASU 2014-09, as amended by ASU 2015-14. The Company is currently evaluating the effect that adoption of ASU 2016-10 will have on its financial statements.

In March 2016, the FASB, issued ASU No. 2016-08, Revenue from Contracts with Customers (Topic 606), Principal versus Agent Considerations (Reporting Revenue Gross versus Net), or ASU 2016-08, which clarifies the implementation guidance on principal versus agent considerations contained in ASU 2014-09 by specifying that the determination as to whether an entity that is involved in providing a good or a service to a customer is a principal or an agent is based upon whether the entity controls the good or the service before it is transferred to the customer. ASU 2016-08 has the same effective date and transition requirements as ASU 2014-09, as amended by ASU 2015-14. The Company is currently evaluating the effect that adoption of ASU 2016-08 will have on its financial statements.

In March 2016, the FASB issued ASU No. 2016-09, Improvements to Employee Share-Based Payment Accounting, or ASU 2016-09, which amends Accounting Standards Codification, or ASC, Topic 718, Compensation – Stock Compensation. ASU 2016-09 simplifies several aspects of the accounting for share-based payment transactions, including the accounting for forfeitures, income tax consequences, classification of awards as either equity or liabilities, and classification on the statement of cash flows. ASU 2016-09 is effective for fiscal years beginning after December 15, 2016, and interim periods within those fiscal years and early adoption is permitted. Certain of the amendments will be applied using a modified retrospective transition method by means of a cumulative-effect adjustment to equity as of the beginning of the period in which ASU 2016-09 is adopted, while other amendments will be applied retrospectively, prospectively or using either a prospective or a retrospective transition method. Upon adoption on January 1, 2017, the Company will account for forfeitures as they occur rather than estimate a forfeiture rate and will record a cumulative-effect adjustment in equity on the date of initial adoption. In periods subsequent to adoption, a higher expense will be recognized related to stock-based awards that are not forfeited. The Company expects that the income tax amendments within ASU 2016-09 will have no impact on its results of operations or cash flows because it is in a net operating loss position with a full valuation allowance.

In May 2014, the FASB issued ASU 2014-09, which changes the principle under which the Company will recognize revenue from contracts with customers from one which requires the Company to satisfy specific criteria before recognizing revenue to one which requires the Company to recognize revenue in an amount that reflects the consideration to which it expects to be entitled in exchange for the transfer of promised goods or services to customers. ASU 2014-09, as amended by ASU 2015-14, is effective for annual reporting periods beginning after December 15, 2017 (i.e., January 1, 2018), including interim periods within those reporting periods. The standard allows for two transition methods: (1) retrospectively to each prior reporting period presented, or (2) using a modified retrospective approach, with the cumulative effect of initially applying ASU 2014-09 recognized as an adjustment to the opening balance of retained earnings at the date of initial adoption. The Company is currently in the process of deciding which method of transition it will use and the effect of adoption of ASU 2014-09 on its results of operations, financial position and cash flows. The Company currently recognizes revenue only from contracts with Maruishi and CKD, under both of which the Company may earn future milestone payments upon the achievement of defined clinical and regulatory events. The Company is continuing to monitor the timing of achievement of such milestones. To the extent that all defined milestones have not been achieved and the related revenue recognized under current GAAP prior to the adoption of ASU 2014-09, those contracts will be included within the scope of ASU 2014-09. However, since the current accounting for those contracts, as multiple element arrangements with milestone revenue recognized using the milestone method, is similar to ASU 2014-09, the Company does not expect a material effect on its financial statements from the adoption of ASU 2014-09.

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Available-for-Sale Marketable Securities

6 Months Ended

Jun. 30, 2016

Investments, Debt and Equity Securities [Abstract]

Available-for-Sale Marketable Securities

3. Available-for-Sale Marketable Securities

As of June 30, 2016 and December 31, 2015, the Company’s available-for-sale marketable securities consisted of money market mutual funds and debt securities issued by the U.S. government and government-sponsored entities and by investment grade institutions.

The following tables summarize the Company’s available-for-sale marketable securities by major type of security as of June 30, 2016 and December 31, 2015:

As of June 30, 2016

			Gross Unrealized
Type of Security	Amortized Cost		Gains		Losses			Estimated Fair Value
Money market mutual funds	$	31,226	$	62	$	—		$	31,288
U.S. Treasury securities		2,503		2		—			2,505
Other U.S. government agency obligations		11,146		6		—			11,152
Corporate bonds		14,581		3		(5	)		14,579
Commercial paper		21,691		4		—			21,695
Total available-for-sale marketable securities	$	81,147	$	77	$	(5	)	$	81,219

As of December 31, 2015

			Gross Unrealized
Type of Security	Amortized Cost		Gains		Losses			Estimated Fair Value
Money market mutual funds	$	42,017	$	—	$	(31	)	$	41,986
U.S. Treasury securities		2,528		—		—			2,528
Other U.S. government agency obligations		13,492		4		—			13,496
Corporate bonds		14,194		—		(6	)		14,188
Commercial paper		19,444		1		(3	)		19,442
Total available-for-sale marketable securities	$	91,675	$	5	$	(40	)	$	91,640

All available-for-sale marketable securities are classified in the Company’s Condensed Balance Sheets as Marketable securities.

The Company classifies its marketable debt securities based on their contractual maturity dates. As of June 30, 2016, the Company’s marketable debt securities mature at various dates through May 2017. The fair values and amortized cost of marketable debt securities by contractual maturity were as follows. The table does not include money market funds that are classified as available-for-sale marketable securities.

	As of June 30, 2016				As of December 31, 2015
Contractual maturity	Fair Value		Amortized Cost		Fair Value		Amortized Cost
Less than one year	$	49,931	$	49,921	$	49,653	$	49,657

During the six months ended June 30, 2016, the Company sold shares of a money market mutual fund that were classified as available-for-sale marketable securities. There were no realized gains or losses from this transaction since the fair value of the shares sold of $10,900 was equal to the carrying value of those shares.

The following tables show the fair value of the Company’s available-for-sale marketable securities that have unrealized losses and that are deemed to be only temporarily impaired, aggregated by investment category and length of time that the individual investments have been in a continuous unrealized loss position.

	Less than 12 Months					12 Months or Greater				Total
As of June 30, 2016	Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses
Corporate bonds	$	11,055	$	(5	)	$	—	$	—	$	11,055	$	(5	)
Total	$	11,055	$	(5	)	$	—	$	—	$	11,055	$	(5	)
	Less than 12 Months					12 Months or Greater				Total
As of December 31, 2015	Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses
Money market mutual funds	$	30,985	$	(31	)	$	—	$	—	$	30,985	$	(31	)
Corporate bonds		14,187		(6	)		—		—		14,187		(6	)
Commercial paper		11,960		(3	)		—		—		11,960		(3	)
Total	$	57,132	$	(40	)	$	—	$	—	$	57,132	$	(40	)

As of June 30, 2016 and December 31, 2015, the Company held a total of 13 out of 38 positions and 15 out of 23 positions, respectively, that were in an unrealized loss position, none of which had been in an unrealized loss position for 12 months or greater. Based on the Company’s review of these securities, the Company believes that the cost basis of its available-for-sale marketable securities is recoverable and that, therefore, it had no other-than-temporary impairments on these securities as of June 30, 2016 and December 31, 2015. The Company does not intend to sell these debt securities and the Company believes it is not more likely than not that it will be required to sell these securities before the recovery of their amortized cost basis, which may be maturity.

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Accumulated Other Comprehensive Income (Loss)

6 Months Ended

Jun. 30, 2016

Equity [Abstract]

Accumulated Other Comprehensive Income (Loss)

4. Accumulated Other Comprehensive Income (Loss)

The following table summarizes the changes in accumulated other comprehensive income (loss), or AOCI, net of tax, from unrealized gains (losses) on available-for-sale marketable securities, the Company’s only component of AOCI, for the six months ended June 30, 2016. For the six months ended June 30, 2015, all of the Company’s funds were held in money market savings and checking accounts that were classified as cash equivalents and not as available-for-sale marketable securities. For the six months ended June 30, 2016, there were no reclassifications from AOCI since there were no sales of available-for-sale marketable securities with realized gains or losses.

	Total Accumulated Other Comprehensive Income (Loss)
Balance, December 31, 2015	$	(35	)
Other comprehensive income before reclassifications		76
Amount reclassified from accumulated other comprehensive income		—
Net current period other comprehensive income		76
Balance, June 30, 2016	$	41

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Fair Value Measurements

6 Months Ended

Jun. 30, 2016

Fair Value Disclosures [Abstract]

Fair Value Measurements

5. Fair Value Measurements

As of June 30, 2016 and December 31, 2015, the Company’s financial instruments consist of cash and cash equivalents, available-for-sale marketable securities, restricted cash, accounts payable and accrued liabilities. The fair values of cash and cash equivalents, restricted cash, accounts payable and accrued liabilities approximate their carrying values due to the short-term nature of these financial instruments. Marketable securities are reported on the Company’s Condensed Balance Sheets at their fair values, based upon pricing of securities with the same or similar investment characteristics as provided by third-party pricing services, as described below.

Current accounting guidance defines fair value, establishes a framework for measuring fair value in accordance with ASC section 820, and requires certain disclosures about fair value measurements. The valuation techniques included in the guidance are based on observable and unobservable inputs. Observable inputs reflect readily obtainable data from independent sources, while unobservable inputs reflect the Company’s assumptions about the inputs that market participants would use in pricing the asset or liability and are developed based on the best information available in the circumstances.

The Company classifies its investments in a fair value hierarchy that is intended to increase consistency and comparability in fair value measurements and related disclosures. The fair value hierarchy is divided into three levels based on the source of inputs as follows:

• Level 1 – Observable inputs – quoted prices in active markets for identical assets and liabilities.

• Level 2 – Observable inputs other than the quoted prices in active markets for identical assets and liabilities – such as quoted prices for similar instruments, quoted prices for identical or similar instruments in inactive markets, or other inputs that are observable or can be corroborated by observable market data.

• Level 3 – Unobservable inputs – includes amounts derived from valuation models where one or more significant inputs are unobservable and require the Company to develop relevant assumptions.

Valuation Techniques - Level 2 Inputs

The Company estimates the fair values of its financial instruments categorized as level 2 in the fair value hierarchy, including U.S. Treasury securities, other U.S. government agency obligations, corporate bonds, commercial paper and money market funds with similar underlying investments, by taking into consideration valuations obtained from third-party pricing services. The pricing services use 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. These inputs include reported trades of and broker/dealer quotes on the same or similar securities, benchmark yields, issuer credit spreads, benchmark securities, and other observable inputs. The Company obtains a single price for each financial instrument and does not adjust the prices obtained from the pricing service.

The Company validates the prices provided by its third party pricing services by reviewing their pricing methods, obtaining market values from other pricing sources and comparing them to the share prices presented by the pricing service. After completing its validation procedures, the Company did not adjust or override any fair value measurements provided by its pricing services as of June 30, 2016 or December 31, 2015.

The following tables summarize the Company’s financial assets measured at fair value on a recurring basis as of June 30, 2016 and December 31, 2015.

Fair value measurement as of June 30, 2016

Financial assets	Total		Quoted prices in active markets for identical assets (Level 1)		Significant other observable inputs (Level 2)		Significant unobservable inputs (Level 3)
Type of Instrument
Cash and cash equivalents:
Money market mutual funds, savings account and checking accounts	$	3,545	$	3,545	$	—	$	—
Available-for-sale marketable securities:
Money market mutual funds		31,288		—		31,288		—
U.S. Treasury securities		2,505		—		2,505		—
Other U.S. government agency obligations		11,152		—		11,152		—
Corporate bonds		14,579		—		14,579		—
Commercial paper		21,695		—		21,695		—
Restricted cash:
Commercial money market account		1,469		1,469		—		—
Total financial assets	$	86,233	$	5,014	$	81,219	$	—

Fair value measurement as of December 31, 2015:

Financial assets	Total		Quoted prices in active markets for identical assets (Level 1)		Significant other observable inputs (Level 2)		Significant unobservable inputs (Level 3)
Type of Instrument
Cash and cash equivalents:
Money market mutual funds, savings account and checking accounts	$	15,101	$	15,101	$	—	$	—
Available-for-sale marketable securities:
Money market mutual funds		41,986				41,986		—
U.S. Treasury securities		2,528				2,528		—
Other U.S. government agency obligations		13,496				13,496		—
Corporate bonds		14,188				14,188		—
Commercial paper		19,442				19,442		—
Restricted cash:
Bank Certificate of Deposit		700		700		—		—
Total financial assets	$	107,441	$	15,801	$	91,640	$	—

There were no purchases, sales or maturities of Level 3 financial assets and no unrealized gains or losses related to Level 3 available-for-sale marketable securities for the six months ended June 30, 2016. There were no transfers of financial assets between Levels 1, 2, or 3 classifications during the six months ended June 30, 2016.

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Restricted Cash

6 Months Ended

Jun. 30, 2016

Receivables [Abstract]

Restricted Cash

6. Restricted Cash

The Company is required to maintain stand-by letters of credit as security deposits under each of its leases, one for its operating facility in Shelton, Connecticut and the other for its office space in Stamford, Connecticut (refer to Note 12, Commitments and Contingencies). The fair value of each letter of credit approximates its contract value. In each case, the Company’s bank requires the Company to maintain restricted cash balances to serve as collateral for the letter of credit issued to the respective landlords by the bank. As of June 30, 2016, the restricted cash balances for the Shelton lease and the Stamford lease were both invested in a commercial money market account.

The restricted cash balance for the Shelton lease remains at $700 through the end of the lease term in 2017. For the Stamford lease, the letter of credit balance remains at $769 for the first three years following commencement of the Stamford lease and may, upon request from the Company, thereafter be reduced to $408 through the end of the lease term in 2023. The reduction in the balance of the letter of credit for the Stamford lease is contingent upon the Company not being in default of any provisions of that lease prior to request for the reduction. As of June 30, 2016 and December 31, 2015, the Company had $1,469 and $700 of restricted cash, respectively, in long-term assets.

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Prepaid Expenses

6 Months Ended

Jun. 30, 2016

Text Block [Abstract]

Prepaid Expenses

7. Prepaid expenses

As of June 30, 2016, prepaid expenses were $3,398, consisting of $2,874 of prepaid R&D clinical costs, $460 of prepaid insurance and $64 of other prepaid costs. As of December 31, 2015, prepaid expenses were $1,729 consisting of $1,500 of prepaid R&D clinical costs, $98 of prepaid insurance, $96 of prepaid rent, and $35 of other prepaid costs.

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Accounts Payable and Accrued Expenses

6 Months Ended

Jun. 30, 2016

Payables and Accruals [Abstract]

Accounts Payable and Accrued Expenses

8. Accounts Payable and Accrued Expenses

Accounts payable and accrued expenses consist of the following:

	June 30, 2016		December 31, 2015
Accounts payable	$	2,931	$	1,965
Accrued research projects		2,779		1,542
Accrued Shelton lease liability		1,232		—
Accrued professional fees		342		371
Accrued compensation and benefits		835		1,204
Accrued other		49		186
Total	$	8,168	$	5,268

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Net Loss Per Share

6 Months Ended

Jun. 30, 2016

Earnings Per Share [Abstract]

Net Loss Per Share

9. Net Loss Per Share

The Company computes basic net income (loss) per share by dividing net income (loss) by the weighted average number of shares of common stock outstanding. Diluted net income per share includes the potential dilutive effect of common stock equivalents as if such securities were exercised during the period, when the effect is dilutive. Common stock equivalents may include outstanding stock options, which are included using the treasury stock method when dilutive. For the three and six months ended June 30, 2016 and 2015, the Company excluded the effects of potentially dilutive shares that were outstanding during those respective periods from the denominator as their inclusion would be anti-dilutive due to the Company’s net losses during those periods.

The denominators used in the net loss per share computations are as follows:

	Three Months Ended June 30,				Six Months Ended June 30,
	2016		2015		2016		2015
Basic:
Weighted average common shares outstanding		27,282,863		22,828,612		27,271,226		22,818,601
Diluted:
Weighted average common shares outstanding - Basic		27,282,863		22,828,612		27,271,226		22,818,601
Common stock options*		—		—		—		—
Denominator for diluted net loss per share		27,282,863		22,828,612		27,271,226		22,818,601

* No amounts were considered as their effects would be anti-dilutive.

Basic and diluted net loss per share are computed as follows:

	Three Months Ended June 30,						Six Months Ended June 30,
	2016			2015			2016			2015
Net loss	$	(13,075	)	$	(5,684	)	$	(23,766	)	$	(10,373	)
Weighted-average common shares outstanding:
Basic and Diluted		27,282,863			22,828,612			27,271,226			22,818,601
Net loss per share, Basic and Diluted	$	(0.48	)	$	(0.25	)	$	(0.87	)	$	(0.45	)

As of June 30, 2016 and 2015, 2,256,700 and 1,583,480 stock options, respectively, were outstanding, which could potentially dilute basic earnings per share in the future, but were not included in the computation of diluted net loss per share because to do so would have been anti-dilutive.

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Stock-Based Compensation

6 Months Ended

Jun. 30, 2016

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Stock-Based Compensation

10. Stock-Based Compensation

2014 Equity Incentive Plan

The Company’s 2014 Equity Incentive Plan, or the 2014 Plan, is administered by the Company’s Board of Directors or a duly authorized committee thereof, referred to as the Plan administrator. The 2014 Plan provides for the grant of incentive stock options, non-statutory stock options, restricted stock awards, restricted stock unit awards, stock appreciation rights, performance stock awards and other forms of equity compensation, collectively referred to as Stock Awards. Additionally, the 2014 Plan provides for the grant of performance cash awards. Incentive stock options may be granted only to employees. All other awards may be granted to employees, including officers, non-employee directors, and consultants. No incentive stock options may be granted under the 2014 Plan after the tenth anniversary of the effective date of the 2014 Plan. Stock Awards granted under the 2014 Plan vest at the rate specified by the Plan administrator, which, for employees and non-employee consultants, has generally been 25% on the first anniversary of the date of grant and the balance ratably over the next 36 months. As of January 1, 2016, subsequent grants of Stock Awards made to employees vest monthly over a period of four years from the grant date. Stock options initially granted to members of the Company’s Board of Directors vest on the date of the Annual Meeting of Stockholders at which their initial term expires based on the class of Director. Subsequent grants to Directors that are made automatically at Annual Meetings of Stockholders vest fully on the first anniversary of the date of grant. The Plan administrator determines the term of Stock Awards granted under the 2014 Plan up to a maximum of ten years.

The aggregate number of shares of the Company’s common stock reserved for issuance under the 2014 Plan will automatically increase on January 1 of each year, beginning on January 1, 2015 and continuing through and including January 1, 2024, by 3% of the total number of shares of the Company’s capital stock outstanding on December 31 of the preceding calendar year, or a lesser number of shares determined by the Company’s Board of Directors. On January 1, 2016, the aggregate number of shares of common stock that may be issued pursuant to stock awards under the 2014 Plan automatically increased from 2,284,061 to 3,101,707. The maximum number of shares that may be issued pursuant to the exercise of incentive stock options under the 2014 Plan is 30,000,000 shares.

Under the 2014 Plan, the Company granted 112,000 and 722,000 stock options during the three and six months ended June 30, 2016, respectively, and 309,000 and 604,000 stock options during the three and six months ended June 30, 2015, respectively. The fair values of stock options granted during the three and six months ended June 30, 2016 and 2015 were estimated as of the dates of grant using the Black-Scholes option pricing model with the following assumptions:

	Three Months Ended June 30,		Six Months Ended June 30,
	2016	2015	2016	2015
Risk-free interest rate	1.23% - 1.79%	1.87% - 1.89%	1.23% - 1.79%	1.43% - 1.89%
Expected volatility	69.3% - 72.6%	64%	67.8% - 72.6%	64% - 67%
Expected dividend yield	0%	0%	0%	0%
Expected life of employee options (in years)	6.25	6.25	6.25	6.25
Expected life of nonemployee options (in years)	10	10	10	10

The weighted average grant date fair value of options granted to employees and members of the Company’s Board of Directors for their service during the three and six months ended June 30, 2016 was $3.55 and $3.80, respectively, and during the three and six months ended June 30, 2015 was $6.41 and $6.32, respectively.

The weighted average fair value of outstanding options that had been granted to nonemployee consultants, as re-measured during the vesting period of each tranche in accordance with ASC 505-50, was $2.82 and $3.26 during the three and six months ended June 30, 2016, respectively, and $8.99 and $8.11 during the three and six months ended June 30, 2015, respectively.

During the three and six months ended June 30, 2016 and 2015, the Company recognized compensation expense relating to stock options, as follows:

	Three Months Ended June 30,				Six Months Ended June 30,
	2016		2015		2016		2015
Research and development	$	303	$	280	$	492	$	478
General and administrative		394		420		702		668
Total stock option expense	$	697	$	700	$	1,194	$	1,146

A summary of stock option award activity related to employees, non-employee members of the Company’s Board of Directors and non-employee consultants as of and for the six months ended June 30, 2016 is presented below:

	Number of Shares			Weighted Average Exercise Price
Outstanding, December 31, 2015		1,658,408		$	10.27
Granted		722,000			5.98
Exercised		(28,000	)		1.41
Forfeited		(94,792	)		12.22
Expired		(916	)		11.00
Outstanding, June 30, 2016		2,256,700			8.92
Options exercisable, June 30, 2016		810,712		$	8.95

The Company does not expect to realize any tax benefits from its stock option activity or the recognition of stock-based compensation expense because the Company currently has net operating losses and has a full valuation allowance against its deferred tax assets. Accordingly, no amounts related to excess tax benefits have been reported in cash flows from operations or cash flows from financing activities for the six months ended June 30, 2016 and 2015.

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Income Taxes

6 Months Ended

Jun. 30, 2016

Income Tax Disclosure [Abstract]

Income Taxes

11. Income Taxes

For the three months ended June 30, 2016 and 2015, pre-tax losses were $13,154 and $5,719, respectively, and for the six months ended June 30, 2016 and 2015, pre-tax losses were $23,990 and $10,423, respectively. The Company recognized a full tax valuation allowance against its deferred tax assets as of June 30, 2016 and December 31, 2015.

The benefit from income taxes of $79 and $35 for the three months ended June 30, 2016 and 2015, respectively, and $224 and $50 for the six months ended June 30, 2016 and 2015, respectively, relates to state R&D tax credits exchanged for cash pursuant to the Connecticut R&D Tax Credit Exchange Program, which permits qualified small businesses engaged in R&D activities within Connecticut to exchange their unused R&D tax credits for a cash amount equal to 65% of the value of the exchanged credits.

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Commitments and Contingencies

6 Months Ended

Jun. 30, 2016

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

12. Commitments and Contingencies

Contractual obligations and commitments as of June 30, 2016 were as follows:

	Payment Due for the Year Ending December 31,
	2016		2017		2018		2019		2020		Thereafter		Total
Stamford operating lease	$	192	$	875	$	1,093	$	1,217	$	1,241	$	3,650	$	8,268
Shelton operating lease		459		740		—		—		—		—		1,199
	$	651	$	1,615	$	1,093	$	1,217	$	1,241	$	3,650	$	9,467

In May 2016, the Company moved its headquarters to Stamford, Connecticut, where it leases office space under an operating lease with a term through October 2023 (See Note 21 of Notes to Financial Statements, Commitments and Contingencies, in the Company’s Annual Report on Form 10-K for the year ended December 31, 2015). As of June 30, 2016, the Stamford landlord had made renovations of approximately $1,094 to the leased premises. Such amount is included in Property and equipment, net and Deferred lease obligation on the Company’s Condensed Balance Sheet. Deferred lease obligation is being amortized as a reduction to rent expense over the same term as rent expense.

As of June 30, 2016, the Company continues to lease its former operating facility located in Shelton, Connecticut, which has a term through October 2017 (See Note 21 of Notes to Financial Statements, Commitments and Contingencies, in the Company’s Annual Report on Form 10-K for the year ended December 31, 2015). The Company accelerated the amortization of the Shelton leasehold improvements through May 2016, the date the Company moved from the Shelton facility, or cease-use date, at which time the net book value of those leasehold improvements was zero. Acceleration of amortization of the Shelton leasehold improvements resulted in $359 and $899 of additional amortization expense (additional net loss per share of $0.01 and $0.03) for the three and six months ended June 30, 2016, respectively.

In addition, in accordance with the accounting guidance in ASC 420-10-25-13 regarding exit or disposal cost obligations, as of May 2016, the Company recorded rent expense, within Research and development expense and General and administrative expense, and accrued a liability of $1,312, which represents the fair value of costs that will continue to be incurred during the remaining term of the Shelton operating lease without economic benefit to the Company. Such liability, which includes the $1,199 of minimum rental payments in the table above together with common area maintenance charges, is included in Accounts payable and accrued expenses on the Company’s Condensed Balance Sheet as of June 30, 2016. At the cease-use date, the Company also wrote off the balance of Deferred lease obligation of $429 related to the Shelton lease.

A reconciliation of the balances of the accrued Shelton lease cease-use liability from May 31, 2016 to June 30, 2016 is as follows:

Balance May 31, 2016	$	1,312
Rental payment, June 2016		(80	)
Balance June 30, 2016	$	1,232

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Basis of Presentation (Policies)

6 Months Ended

Jun. 30, 2016

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Use of Estimates

Use of Estimates

The preparation of financial statements in conformity with GAAP requires the Company to make estimates and assumptions that affect the reported amounts of assets and liabilities, and disclosure of contingent assets and liabilities, as of the date of the financial statements as well as the reported amounts of revenues and expenses during the reporting period. Actual results could differ materially from the Company’s estimates and assumptions. Significant estimates include the fair value of marketable securities that are classified as level 2 of the fair value hierarchy, useful lives of fixed assets, the periods over which certain revenues will be recognized, including licensing and collaborative revenue recognized from non-refundable up-front and milestone payments, the determination of prepaid research and development, or R&D, clinical costs and accrued research projects, the amount of non-cash compensation costs related to share-based payments to employees and non-employees and the periods over which those costs are expensed and the likelihood of realization of deferred tax assets.

Significant Accounting Policies

Significant Accounting Policies

There have been no material changes to the significant accounting policies previously disclosed in Note 2 to the Financial Statements in the Company’s Annual Report on Form 10-K for the year ended December 31, 2015.

Recent Accounting Pronouncements

Recent Accounting Pronouncements

In June 2016, the Financial Accounting Standards Board, or FASB, issued Accounting Standards Update, or ASU, No. 2016-13, Financial Instruments—Credit Losses (Topic 326) Measurement of Credit Losses on Financial Instruments, or ASU 2016-13, which replaces the incurred loss impairment methodology in current GAAP, that delays recognition of a credit loss until it is probable that such loss has been incurred, with a methodology that reflects expected credit losses and requires consideration of a broader range of reasonable and supportable information to inform credit loss estimates. ASU 2016-13 modifies the other-than-temporary impairment model for available-for-sale debt securities by requiring (1) estimating expected credit losses only when the fair value is below the amortized cost of the asset; (2) recording a credit loss without regard to the length of time a security has been in an unrealized loss position; (3) limiting the measurement of the credit loss to the difference between the security’s amortized cost basis and its fair value and (4) presenting credit losses as an allowance rather than as a write-down, which will allow the Company to record reversals of credit losses in current period net income, a practice that is currently prohibited. ASU 2016-13 will be effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. The Company is currently evaluating the effect that adoption of ASU 2016-13 will have on its results of operations, financial position and cash flows.

In May 2016, the FASB, issued ASU No. 2016-12, Revenue from Contracts with Customers (Topic 606): Narrow-Scope Improvements and Practical Expedients, or ASU 2016-12, which amends guidance in the new revenue standard, ASU No. 2014-09Revenue from Contracts with Customers (Topic 606), or ASU 2014-09, on collectability, noncash consideration, presentation of sales tax and transition. The amendments in ASU 2016-12 are effective for annual reporting periods beginning after December 15, 2017 (i.e., January 1, 2018), including interim periods within those reporting periods, which is the same as for ASU 2014-09, as amended by ASU No. 2015-14, Revenue from Contracts with Customers (Topic 606): Deferral of the Effective Date, or ASU 2015-14. The Company is currently evaluating the effect that adoption of ASU 2016-12 will have on its financial statements.

In April 2016, the FASB issued ASU No. 2016-10, Revenue from Contracts with Customers (Topic 606), Identifying Performance Obligations and Licensing, or ASU 2016-10, which clarifies the principle for determining whether a good or service is “separately identifiable” from other promises in the contract and, therefore, should be accounted for as a separate performance obligation. In that regard, ASU 2016-10 requires that an entity determine whether its promise is to transfer individual goods or services to the customer, or a combined item (or items) to which the individual goods and services are inputs. In addition, ASU 2016-10 categorizes intellectual property, or IP, into two categories: “functional” and “symbolic.” Functional IP has significant standalone functionality. All other IP is considered symbolic IP. Revenue from licenses of functional IP is generally recognized at a point in time, while revenue from licenses of symbolic IP is recognized over time. ASU 2016-10 has the same effective date and transition requirements as ASU 2014-09, as amended by ASU 2015-14. The Company is currently evaluating the effect that adoption of ASU 2016-10 will have on its financial statements.

In March 2016, the FASB, issued ASU No. 2016-08, Revenue from Contracts with Customers (Topic 606), Principal versus Agent Considerations (Reporting Revenue Gross versus Net), or ASU 2016-08, which clarifies the implementation guidance on principal versus agent considerations contained in ASU 2014-09 by specifying that the determination as to whether an entity that is involved in providing a good or a service to a customer is a principal or an agent is based upon whether the entity controls the good or the service before it is transferred to the customer. ASU 2016-08 has the same effective date and transition requirements as ASU 2014-09, as amended by ASU 2015-14. The Company is currently evaluating the effect that adoption of ASU 2016-08 will have on its financial statements.

In March 2016, the FASB issued ASU No. 2016-09, Improvements to Employee Share-Based Payment Accounting, or ASU 2016-09, which amends Accounting Standards Codification, or ASC, Topic 718, Compensation – Stock Compensation. ASU 2016-09 simplifies several aspects of the accounting for share-based payment transactions, including the accounting for forfeitures, income tax consequences, classification of awards as either equity or liabilities, and classification on the statement of cash flows. ASU 2016-09 is effective for fiscal years beginning after December 15, 2016, and interim periods within those fiscal years and early adoption is permitted. Certain of the amendments will be applied using a modified retrospective transition method by means of a cumulative-effect adjustment to equity as of the beginning of the period in which ASU 2016-09 is adopted, while other amendments will be applied retrospectively, prospectively or using either a prospective or a retrospective transition method. Upon adoption on January 1, 2017, the Company will account for forfeitures as they occur rather than estimate a forfeiture rate and will record a cumulative-effect adjustment in equity on the date of initial adoption. In periods subsequent to adoption, a higher expense will be recognized related to stock-based awards that are not forfeited. The Company expects that the income tax amendments within ASU 2016-09 will have no impact on its results of operations or cash flows because it is in a net operating loss position with a full valuation allowance.

In May 2014, the FASB issued ASU 2014-09, which changes the principle under which the Company will recognize revenue from contracts with customers from one which requires the Company to satisfy specific criteria before recognizing revenue to one which requires the Company to recognize revenue in an amount that reflects the consideration to which it expects to be entitled in exchange for the transfer of promised goods or services to customers. ASU 2014-09, as amended by ASU 2015-14, is effective for annual reporting periods beginning after December 15, 2017 (i.e., January 1, 2018), including interim periods within those reporting periods. The standard allows for two transition methods: (1) retrospectively to each prior reporting period presented, or (2) using a modified retrospective approach, with the cumulative effect of initially applying ASU 2014-09 recognized as an adjustment to the opening balance of retained earnings at the date of initial adoption. The Company is currently in the process of deciding which method of transition it will use and the effect of adoption of ASU 2014-09 on its results of operations, financial position and cash flows. The Company currently recognizes revenue only from contracts with Maruishi and CKD, under both of which the Company may earn future milestone payments upon the achievement of defined clinical and regulatory events. The Company is continuing to monitor the timing of achievement of such milestones. To the extent that all defined milestones have not been achieved and the related revenue recognized under current GAAP prior to the adoption of ASU 2014-09, those contracts will be included within the scope of ASU 2014-09. However, since the current accounting for those contracts, as multiple element arrangements with milestone revenue recognized using the milestone method, is similar to ASU 2014-09, the Company does not expect a material effect on its financial statements from the adoption of ASU 2014-09.

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Available-for-Sale Marketable Securities (Tables)

6 Months Ended

Jun. 30, 2016

Investments, Debt and Equity Securities [Abstract]

Summary of Available-for-Sale Marketable Securities by Major Type of Security

The following tables summarize the Company’s available-for-sale marketable securities by major type of security as of June 30, 2016 and December 31, 2015:

As of June 30, 2016

			Gross Unrealized
Type of Security	Amortized Cost		Gains		Losses			Estimated Fair Value
Money market mutual funds	$	31,226	$	62	$	—		$	31,288
U.S. Treasury securities		2,503		2		—			2,505
Other U.S. government agency obligations		11,146		6		—			11,152
Corporate bonds		14,581		3		(5	)		14,579
Commercial paper		21,691		4		—			21,695
Total available-for-sale marketable securities	$	81,147	$	77	$	(5	)	$	81,219

As of December 31, 2015

			Gross Unrealized
Type of Security	Amortized Cost		Gains		Losses			Estimated Fair Value
Money market mutual funds	$	42,017	$	—	$	(31	)	$	41,986
U.S. Treasury securities		2,528		—		—			2,528
Other U.S. government agency obligations		13,492		4		—			13,496
Corporate bonds		14,194		—		(6	)		14,188
Commercial paper		19,444		1		(3	)		19,442
Total available-for-sale marketable securities	$	91,675	$	5	$	(40	)	$	91,640

Schedule of Fair Values and Amortized Cost of Marketable Debt Securities by Contractual Maturity

The Company classifies its marketable debt securities based on their contractual maturity dates. As of June 30, 2016, the Company’s marketable debt securities mature at various dates through May 2017. The fair values and amortized cost of marketable debt securities by contractual maturity were as follows. The table does not include money market funds that are classified as available-for-sale marketable securities.

	As of June 30, 2016				As of December 31, 2015
Contractual maturity	Fair Value		Amortized Cost		Fair Value		Amortized Cost
Less than one year	$	49,931	$	49,921	$	49,653	$	49,657

Schedule of Fair Values and Continuous Unrealized Loss Positions of Available-for-Sale Marketable Securities

The following tables show the fair value of the Company’s available-for-sale marketable securities that have unrealized losses and that are deemed to be only temporarily impaired, aggregated by investment category and length of time that the individual investments have been in a continuous unrealized loss position.

	Less than 12 Months					12 Months or Greater				Total
As of June 30, 2016	Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses
Corporate bonds	$	11,055	$	(5	)	$	—	$	—	$	11,055	$	(5	)
Total	$	11,055	$	(5	)	$	—	$	—	$	11,055	$	(5	)
	Less than 12 Months					12 Months or Greater				Total
As of December 31, 2015	Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses
Money market mutual funds	$	30,985	$	(31	)	$	—	$	—	$	30,985	$	(31	)
Corporate bonds		14,187		(6	)		—		—		14,187		(6	)
Commercial paper		11,960		(3	)		—		—		11,960		(3	)
Total	$	57,132	$	(40	)	$	—	$	—	$	57,132	$	(40	)

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Accumulated Other Comprehensive Income (Loss) (Tables)

6 Months Ended

Jun. 30, 2016

Equity [Abstract]

Summary of Changes in Accumulated Other Comprehensive Income (Loss), Net of Tax, from Unrealized Gains (Losses) on Available-for-Sale Marketable Securities

The following table summarizes the changes in accumulated other comprehensive income (loss), or AOCI, net of tax, from unrealized gains (losses) on available-for-sale marketable securities, the Company’s only component of AOCI, for the six months ended June 30, 2016. For the six months ended June 30, 2015, all of the Company’s funds were held in money market savings and checking accounts that were classified as cash equivalents and not as available-for-sale marketable securities. For the six months ended June 30, 2016, there were no reclassifications from AOCI since there were no sales of available-for-sale marketable securities with realized gains or losses.

	Total Accumulated Other Comprehensive Income (Loss)
Balance, December 31, 2015	$	(35	)
Other comprehensive income before reclassifications		76
Amount reclassified from accumulated other comprehensive income		—
Net current period other comprehensive income		76
Balance, June 30, 2016	$	41

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Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2016

Fair Value Disclosures [Abstract]

Summary of Financial Assets Measured at Fair Value on Recurring Basis

The following tables summarize the Company’s financial assets measured at fair value on a recurring basis as of June 30, 2016 and December 31, 2015.

Fair value measurement as of June 30, 2016

Financial assets	Total		Quoted prices in active markets for identical assets (Level 1)		Significant other observable inputs (Level 2)		Significant unobservable inputs (Level 3)
Type of Instrument
Cash and cash equivalents:
Money market mutual funds, savings account and checking accounts	$	3,545	$	3,545	$	—	$	—
Available-for-sale marketable securities:
Money market mutual funds		31,288		—		31,288		—
U.S. Treasury securities		2,505		—		2,505		—
Other U.S. government agency obligations		11,152		—		11,152		—
Corporate bonds		14,579		—		14,579		—
Commercial paper		21,695		—		21,695		—
Restricted cash:
Commercial money market account		1,469		1,469		—		—
Total financial assets	$	86,233	$	5,014	$	81,219	$	—

Fair value measurement as of December 31, 2015:

Financial assets	Total		Quoted prices in active markets for identical assets (Level 1)		Significant other observable inputs (Level 2)		Significant unobservable inputs (Level 3)
Type of Instrument
Cash and cash equivalents:
Money market mutual funds, savings account and checking accounts	$	15,101	$	15,101	$	—	$	—
Available-for-sale marketable securities:
Money market mutual funds		41,986				41,986		—
U.S. Treasury securities		2,528				2,528		—
Other U.S. government agency obligations		13,496				13,496		—
Corporate bonds		14,188				14,188		—
Commercial paper		19,442				19,442		—
Restricted cash:
Bank Certificate of Deposit		700		700		—		—
Total financial assets	$	107,441	$	15,801	$	91,640	$	—

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Accounts Payable and Accrued Expenses (Tables)

6 Months Ended

Jun. 30, 2016

Payables and Accruals [Abstract]

Schedule of Accounts Payable and Accrued Expenses

Accounts payable and accrued expenses consist of the following:

	June 30, 2016		December 31, 2015
Accounts payable	$	2,931	$	1,965
Accrued research projects		2,779		1,542
Accrued Shelton lease liability		1,232		—
Accrued professional fees		342		371
Accrued compensation and benefits		835		1,204
Accrued other		49		186
Total	$	8,168	$	5,268

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Net Loss Per Share (Tables)

6 Months Ended

Jun. 30, 2016

Earnings Per Share [Abstract]

Computation of Denominators Used in Net Loss per Share

The denominators used in the net loss per share computations are as follows:

	Three Months Ended June 30,				Six Months Ended June 30,
	2016		2015		2016		2015
Basic:
Weighted average common shares outstanding		27,282,863		22,828,612		27,271,226		22,818,601
Diluted:
Weighted average common shares outstanding - Basic		27,282,863		22,828,612		27,271,226		22,818,601
Common stock options*		—		—		—		—
Denominator for diluted net loss per share		27,282,863		22,828,612		27,271,226		22,818,601

* No amounts were considered as their effects would be anti-dilutive.

Computation of Basic and Diluted Net Loss per Share

Basic and diluted net loss per share are computed as follows:

	Three Months Ended June 30,						Six Months Ended June 30,
	2016			2015			2016			2015
Net loss	$	(13,075	)	$	(5,684	)	$	(23,766	)	$	(10,373	)
Weighted-average common shares outstanding:
Basic and Diluted		27,282,863			22,828,612			27,271,226			22,818,601
Net loss per share, Basic and Diluted	$	(0.48	)	$	(0.25	)	$	(0.87	)	$	(0.45	)

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Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2016

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Summary of Assumptions Used in Black-Scholes Option Pricing Model

The fair values of stock options granted during the three and six months ended June 30, 2016 and 2015 were estimated as of the dates of grant using the Black-Scholes option pricing model with the following assumptions:

	Three Months Ended June 30,		Six Months Ended June 30,
	2016	2015	2016	2015
Risk-free interest rate	1.23% - 1.79%	1.87% - 1.89%	1.23% - 1.79%	1.43% - 1.89%
Expected volatility	69.3% - 72.6%	64%	67.8% - 72.6%	64% - 67%
Expected dividend yield	0%	0%	0%	0%
Expected life of employee options (in years)	6.25	6.25	6.25	6.25
Expected life of nonemployee options (in years)	10	10	10	10

Summary of Compensation Expense Relating to Stock Options

During the three and six months ended June 30, 2016 and 2015, the Company recognized compensation expense relating to stock options, as follows:

	Three Months Ended June 30,				Six Months Ended June 30,
	2016		2015		2016		2015
Research and development	$	303	$	280	$	492	$	478
General and administrative		394		420		702		668
Total stock option expense	$	697	$	700	$	1,194	$	1,146

Summary of Stock Option Award Activity

A summary of stock option award activity related to employees, non-employee members of the Company’s Board of Directors and non-employee consultants as of and for the six months ended June 30, 2016 is presented below:

	Number of Shares			Weighted Average Exercise Price
Outstanding, December 31, 2015		1,658,408		$	10.27
Granted		722,000			5.98
Exercised		(28,000	)		1.41
Forfeited		(94,792	)		12.22
Expired		(916	)		11.00
Outstanding, June 30, 2016		2,256,700			8.92
Options exercisable, June 30, 2016		810,712		$	8.95

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Commitments and Contingencies (Tables)

6 Months Ended

Jun. 30, 2016

Commitments and Contingencies Disclosure [Abstract]

Schedule of Contractual Obligations and Commitments

Contractual obligations and commitments as of June 30, 2016 were as follows:

	Payment Due for the Year Ending December 31,
	2016		2017		2018		2019		2020		Thereafter		Total
Stamford operating lease	$	192	$	875	$	1,093	$	1,217	$	1,241	$	3,650	$	8,268
Shelton operating lease		459		740		—		—		—		—		1,199
	$	651	$	1,615	$	1,093	$	1,217	$	1,241	$	3,650	$	9,467

Schedule of Reconciliation of Balances of Accrued Shelton Lease Cease-Use Liability

A reconciliation of the balances of the accrued Shelton lease cease-use liability from May 31, 2016 to June 30, 2016 is as follows:

Balance May 31, 2016	$	1,312
Rental payment, June 2016		(80	)
Balance June 30, 2016	$	1,232

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Business - Additional Information (Detail) - USD ($) $ in Thousands		1 Months Ended					3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2016	Oct. 31, 2015	Sep. 30, 2015	Aug. 31, 2015	Aug. 31, 2014	Apr. 30, 2013	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2012	Dec. 31, 2015
Nature Of Business [Line Items]
Date of formation									Jul. 02, 2004
Proceeds from equity and debt financing	$ 204,800
Upfront and milestone payments received in connection with license agreements	32,500
Unrestricted cash and cash equivalents and marketable securities	84,764						$ 84,764		$ 84,764
Accumulated deficit	$ 128,657						128,657		128,657			$ 104,891
Net loss							$ 13,075	$ 5,684	23,766	$ 10,373
Net cash used in operating activities									$ 21,292	$ 9,495
Minimum [Member]
Nature Of Business [Line Items]
Expected period to fund operations									1 year
Maruishi Pharmaceutical Co., Ltd. [Member]
Nature Of Business [Line Items]
Upfront license fee received						$ 15,000
Milestone payment received			$ 1,725		$ 480
Chong Kun Dang Pharmaceutical Corporation [Member]
Nature Of Business [Line Items]
Milestone payment received		$ 417		$ 209
Upfront and milestone payments related to license agreement											$ 1,190

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Available-for-Sale Marketable Securities - Summary of Available-for-Sale Marketable Securities by Major Type of Security (Detail) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 81,147	$ 91,675
Gross Unrealized Gains	77	5
Gross Unrealized Losses	(5)	(40)
Estimated Fair Value	81,219	91,640
Money Market Mutual Funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	31,226	42,017
Gross Unrealized Gains	62
Gross Unrealized Losses		(31)
Estimated Fair Value	31,288	41,986
U.S. Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2,503	2,528
Gross Unrealized Gains	2
Estimated Fair Value	2,505	2,528
Other U.S. Government Agency Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	11,146	13,492
Gross Unrealized Gains	6	4
Estimated Fair Value	11,152	13,496
Corporate Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	14,581	14,194
Gross Unrealized Gains	3
Gross Unrealized Losses	(5)	(6)
Estimated Fair Value	14,579	14,188
Commercial Paper [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	21,691	19,444
Gross Unrealized Gains	4	1
Gross Unrealized Losses		(3)
Estimated Fair Value	$ 21,695	$ 19,442

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Available-for-Sale Marketable Securities - Schedule of Fair Values and Amortized Cost of Marketable Debt Securities by Contractual Maturity (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Investments, Debt and Equity Securities [Abstract]
Fair value of marketable debt securities, contractual maturity, Less than one year	$ 49,931	$ 49,653
Amortized Cost of marketable debt securities, contractual maturity, Less than one year	$ 49,921	$ 49,657

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Available-for-Sale Marketable Securities - Additional Information (Detail)	6 Months Ended
	Jun. 30, 2016 USD ($) Position	Dec. 31, 2015 Position
Investments, Debt and Equity Securities [Abstract]
Proceeds from sale of available-for-sale marketable securities | $	$ 10,900,000
Realized gains or losses | $	$ 0
Number of available-for-sale marketable securities in unrealized loss positions | Position	13	15
Total number of positions | Position	38	23

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Available-for-Sale Marketable Securities - Schedule of Fair Values and Continuous Unrealized Loss Positions of Available-for-Sale Marketable Securities (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale marketable securities, continuous unrealized loss position, Less than 12 Months, Fair Value	$ 11,055	$ 57,132
Available-for-sale marketable securities, continuous unrealized loss position, Less than 12 Months, Gross Unrealized Losses	(5)	(40)
Available-for-sale marketable securities, continuous unrealized loss position, 12 Months or Greater, Fair Value	0	0
Available-for-sale marketable securities, continuous unrealized loss position, 12 Months or Greater, Gross Unrealized Losses	0	0
Available-for-sale marketable securities, continuous unrealized loss position, Fair Value	11,055	57,132
Available-for-sale marketable securities, continuous unrealized loss position, Gross Unrealized Losses	(5)	(40)
Money Market Mutual Funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale marketable securities, continuous unrealized loss position, Less than 12 Months, Fair Value		30,985
Available-for-sale marketable securities, continuous unrealized loss position, Less than 12 Months, Gross Unrealized Losses		(31)
Available-for-sale marketable securities, continuous unrealized loss position, 12 Months or Greater, Fair Value		0
Available-for-sale marketable securities, continuous unrealized loss position, 12 Months or Greater, Gross Unrealized Losses		0
Available-for-sale marketable securities, continuous unrealized loss position, Fair Value		30,985
Available-for-sale marketable securities, continuous unrealized loss position, Gross Unrealized Losses		(31)
Corporate Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale marketable securities, continuous unrealized loss position, Less than 12 Months, Fair Value	11,055	14,187
Available-for-sale marketable securities, continuous unrealized loss position, Less than 12 Months, Gross Unrealized Losses	(5)	(6)
Available-for-sale marketable securities, continuous unrealized loss position, 12 Months or Greater, Fair Value	0	0
Available-for-sale marketable securities, continuous unrealized loss position, 12 Months or Greater, Gross Unrealized Losses	0	0
Available-for-sale marketable securities, continuous unrealized loss position, Fair Value	11,055	14,187
Available-for-sale marketable securities, continuous unrealized loss position, Gross Unrealized Losses	$ (5)	(6)
Commercial Paper [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale marketable securities, continuous unrealized loss position, Less than 12 Months, Fair Value		11,960
Available-for-sale marketable securities, continuous unrealized loss position, Less than 12 Months, Gross Unrealized Losses		(3)
Available-for-sale marketable securities, continuous unrealized loss position, 12 Months or Greater, Fair Value		0
Available-for-sale marketable securities, continuous unrealized loss position, 12 Months or Greater, Gross Unrealized Losses		0
Available-for-sale marketable securities, continuous unrealized loss position, Fair Value		11,960
Available-for-sale marketable securities, continuous unrealized loss position, Gross Unrealized Losses		$ (3)

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Accumulated Other Comprehensive Income (Loss) - Summary of Changes in Accumulated Other Comprehensive Income (Loss), Net of Tax, from Unrealized Gains (Losses) on Available-for-Sale Marketable Securities (Detail) $ in Thousands	6 Months Ended
	Jun. 30, 2016 USD ($)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Total Accumulated Other Comprehensive Income (Loss), Beginning Balance	$ (35)
Other comprehensive income before reclassifications	76
Amount reclassified from accumulated other comprehensive income	0
Net current period other comprehensive income	76
Total Accumulated Other Comprehensive Income (Loss), Ending Balance	$ 41

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Fair Value Measurements - Summary of Financial Assets Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Financial assets
Available-for-sale marketable securities	$ 81,219	$ 91,640
Corporate Bonds [Member]
Financial assets
Available-for-sale marketable securities	14,579	14,188
Recurring [Member]
Financial assets
Total financial assets	86,233	107,441
Recurring [Member] | Corporate Bonds [Member]
Financial assets
Available-for-sale marketable securities	14,579	14,188
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Financial assets
Total financial assets	5,014	15,801
Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]
Financial assets
Total financial assets	81,219	91,640
Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Corporate Bonds [Member]
Financial assets
Available-for-sale marketable securities	14,579	14,188
Recurring [Member] | Money Market Mutual Funds [Member]
Financial assets
Cash and cash equivalents	3,545	15,101
Available-for-sale marketable securities	31,288	41,986
Recurring [Member] | Money Market Mutual Funds [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Financial assets
Cash and cash equivalents	3,545	15,101
Recurring [Member] | Money Market Mutual Funds [Member] | Significant Other Observable Inputs (Level 2) [Member]
Financial assets
Available-for-sale marketable securities	31,288	41,986
Recurring [Member] | Commercial Paper [Member]
Financial assets
Available-for-sale marketable securities	21,695	19,442
Recurring [Member] | Commercial Paper [Member] | Significant Other Observable Inputs (Level 2) [Member]
Financial assets
Available-for-sale marketable securities	21,695	19,442
Recurring [Member] | Other U.S. Government Agency Obligations [Member]
Financial assets
Available-for-sale marketable securities	11,152	13,496
Recurring [Member] | Other U.S. Government Agency Obligations [Member] | Significant Other Observable Inputs (Level 2) [Member]
Financial assets
Available-for-sale marketable securities	11,152	13,496
Recurring [Member] | U.S. Treasury Securities [Member]
Financial assets
Available-for-sale marketable securities	2,505	2,528
Recurring [Member] | U.S. Treasury Securities [Member] | Significant Other Observable Inputs (Level 2) [Member]
Financial assets
Available-for-sale marketable securities	2,505	2,528
Recurring [Member] | Bank Certificate of Deposit [Member]
Financial assets
Restricted cash		700
Recurring [Member] | Bank Certificate of Deposit [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Financial assets
Restricted cash		$ 700
Recurring [Member] | Commercial Money Market Account [Member]
Financial assets
Restricted cash	1,469
Recurring [Member] | Commercial Money Market Account [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Financial assets
Restricted cash	$ 1,469

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Fair Value Measurements - Additional Information (Detail)	6 Months Ended
	Jun. 30, 2016 USD ($) Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Purchases of financial assets	$ 0
Sales of financial assets	0
Maturities of financial assets	$ 0
Transfers of financial assets between Levels 1, 2, or 3 classifications | Securities	0
Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Unrealized gains	$ 0
Unrealized losses	$ 0

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Restricted Cash - Additional Information (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash balance	$ 1,469	$ 700
Shelton Lease [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash balance	$ 700
Lease term	2017
Stamford Lease [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Lease term	2023
Letter of credit, remaining amount	$ 769
Letter of credit, remaining amount after three years	$ 408

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Prepaid Expenses - Additional Information (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Prepaid expenses	$ 3,398	$ 1,729
Prepaid insurance	460	98
Prepaid R&D clinical costs	2,874	1,500
Other prepaid costs	$ 64	35
Prepaid rent		$ 96

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Accounts Payable and Accrued Expenses - Schedule of Accounts Payable and Accrued Expenses (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	May 31, 2016	Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts payable	$ 2,931		$ 1,965
Accrued research projects	2,779		1,542
Accrued professional fees	342		371
Accrued compensation and benefits	835		1,204
Accrued other	49		186
Total	8,168		$ 5,268
Shelton Operating Lease [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accrued Shelton lease liability	$ 1,232	$ 1,312

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Net Loss Per Share - Computation of Denominators Used in Net Loss per Share (Detail) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Basic:
Weighted average common shares outstanding	27,282,863	22,828,612	27,271,226	22,818,601
Diluted:
Weighted average common shares outstanding - Basic	27,282,863	22,828,612	27,271,226	22,818,601
Common stock options	0	0	0	0
Denominator for diluted net loss per share	27,282,863	22,828,612	27,271,226	22,818,601

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Net Loss Per Share - Computation of Basic and Diluted Net Loss per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Earnings Per Share [Abstract]
Net loss	$ (13,075)	$ (5,684)	$ (23,766)	$ (10,373)
Weighted-average common shares outstanding:
Basic and Diluted	27,282,863	22,828,612	27,271,226	22,818,601
Net loss per share, Basic and Diluted	$ (0.48)	$ (0.25)	$ (0.87)	$ (0.45)

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Net Loss Per Share - Additional Information (Detail) - shares	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive common stock equivalents	2,256,700	1,583,480

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Stock-Based Compensation - Additional Information (Detail) - USD ($)		3 Months Ended		6 Months Ended
	Jan. 01, 2016	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Excess tax benefits reported in cash flows from operations				$ 0	$ 0
Excess tax benefits reported in cash flows from financing activities				$ 0	$ 0
Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of options granted		$ 3.55	$ 6.41	$ 3.80	$ 6.32
Nonemployee Consultants [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average fair values of outstanding options		$ 2.82	$ 8.99	$ 3.26	$ 8.11
2014 Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of stock options that may be granted after the tenth anniversary of the 2014 Plan				0
Annual increases in number of shares reserved for issuance as a percentage of shares of capital stock outstanding through January 1, 2024				3.00%
Share-based compensation arrangement by share-based payment award, number of shares authorized	3,101,707					2,284,061
Options granted		112,000	309,000	722,000	604,000
2014 Equity Incentive Plan [Member] | Share-Based Compensation Award, Tranche One [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of vested shares on first anniversary of grant date				25.00%
2014 Equity Incentive Plan [Member] | Share-based Compensation Award, Tranche Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of awards granted				36 months
2014 Equity Incentive Plan [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Term of awards granted				10 years
2014 Equity Incentive Plan [Member] | Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of awards granted	4 years
2014 Equity Incentive Plan [Member] | Incentive Stock Options [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, number of shares authorized		30,000,000		30,000,000

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Stock-Based Compensation - Summary of Assumptions Used in Black-Scholes Option Pricing Model (Detail)	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate, minimum	1.23%	1.87%	1.23%	1.43%
Risk-free interest rate, maximum	1.79%	1.89%	1.79%	1.89%
Expected volatility, minimum	69.30%		67.80%	64.00%
Expected volatility, maximum	72.60%		72.60%	67.00%
Expected volatility		64.00%
Expected dividend yield	0.00%	0.00%	0.00%	0.00%
Employee Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected life of options (in years)	6 years 3 months	6 years 3 months	6 years 3 months	6 years 3 months
Nonemployee Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected life of options (in years)	10 years	10 years	10 years	10 years

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Stock-Based Compensation - Summary of Compensation Expense Relating to Stock Options (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock option expense	$ 697	$ 700	$ 1,194	$ 1,146
Research and Development [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock option expense	303	280	492	478
General and Administrative [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock option expense	$ 394	$ 420	$ 702	$ 668

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Stock-Based Compensation - Summary of Stock Option Award Activity (Detail) - 2014 Equity Incentive Plan [Member] - $ / shares	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares, Outstanding, at December 31, 2015			1,658,408
Number of Shares, Granted	112,000	309,000	722,000	604,000
Number of Shares, Exercised			(28,000)
Number of shares, Forfeited			(94,792)
Number of shares, Expired			(916)
Number of Shares, Outstanding, June 30, 2016	2,256,700		2,256,700
Number of Shares, Options exercisable, June 30, 2016	810,712		810,712
Weighted-Average Exercise Price, Outstanding, at December 31, 2015			$ 10.27
Weighted-Average Exercise Price, Granted			5.98
Weighted-Average Exercise Price, Exercised			1.41
Weighted-Average Exercise Price, Forfeited			12.22
Weighted-Average Exercise Price, Expired			11.00
Weighted Average Exercise Price, Outstanding, June 30, 2016	$ 8.92		8.92
Weighted Average Exercise Price, Options exercisable, June 30, 2016	$ 8.95		$ 8.95

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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Income Tax Disclosure [Abstract]
Pre-tax losses	$ 13,154	$ 5,719	$ 23,990	$ 10,423
Benefit from income taxes	$ 79	$ 35	$ 224	$ 50
Percentage of annual research and development credit for cash			65.00%

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Commitments and Contingencies - Schedule of Contractual Obligations and Commitments (Detail) $ in Thousands	Jun. 30, 2016 USD ($)
Operating Leased Assets [Line Items]
2016	$ 651
2017	1,615
2018	1,093
2019	1,217
2020	1,241
Thereafter	3,650
Total	9,467
Stamford Operating Lease [Member]
Operating Leased Assets [Line Items]
2016	192
2017	875
2018	1,093
2019	1,217
2020	1,241
Thereafter	3,650
Total	8,268
Shelton Operating Lease [Member]
Operating Leased Assets [Line Items]
2016	459
2017	740
Total	$ 1,199

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Commitments and Contingencies - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2016	May 31, 2016	Dec. 31, 2015
Other Commitments [Line Items]
Capitalized Lease renovation expenses	$ 1,433	$ 1,433		$ 1,263
Lease minimum rental payment	9,467	9,467
Stamford Operating Lease [Member]
Other Commitments [Line Items]
Capitalized Lease renovation expenses	1,094	1,094
Lease minimum rental payment	8,268	8,268
Shelton Operating Lease [Member]
Other Commitments [Line Items]
Net book value of leasehold improvements	0	0
Additional amortization expense	$ 359	$ 899
Additional loss per share	$ 0.01	$ 0.03
Accrued cease use date liability	$ 1,232	$ 1,232	$ 1,312
Accumulated deferred lease obligation, written off	429	429
Lease minimum rental payment	$ 1,199	$ 1,199

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Commitments and Contingencies - Schedule of Reconciliation of Balances of Accrued Shelton Lease Cease-Use Liability (Detail) - Shelton Operating Lease [Member] $ in Thousands	1 Months Ended
	Jun. 30, 2016 USD ($)
Restructuring Reserve Disclosures [Abstract]
Balance May 31, 2016	$ 1,312
Rental payment, June 2016	(80)
Balance June 30, 2016	$ 1,232