Fair Value of Financial Instruments (Tables)

9 Months Ended

Sep. 30, 2014

Fair Value Disclosures [Abstract]

Summary of Assets and Liabilities Measured at Fair Value on Recurring Basis

The following table summarizes the assets measured at fair value on a recurring basis at September 30, 2014 (in thousands):

Description	September 30, 2014		Active Markets (Level 1)		Observable Inputs (Level 2)		Unobservable Inputs (Level 3)
Assets:
Cash and cash equivalents	$	35,943	$	35,943	$	—	$	—
Total	$	35,943	$	35,943	$	—	$	—

The following table summarizes the assets and liabilities measured at fair value on a recurring basis at December 31, 2013 (in thousands):

Description	December 31, 2013		Active Markets (Level 1)		Observable Inputs (Level 2)		Unobservable Inputs (Level 3)
Assets:
Cash and cash equivalents	$	7,942	$	7,942	$	—	$	—
Total	$	7,942	$	7,942	$	—	$	—

Description	December 31, 2013		Active Markets (Level 1)		Observable Inputs (Level 2)		Unobservable Inputs (Level 3)
Liabilities:
Warrant liability	$	297	$	—	$	—	$	297
Total	$	297	$	—	$	—	$	297

Summary of Changes in Fair Value of Company's Preferred Stock Warrant Liability

The following table sets forth a summary of changes in the fair value of the Company’s preferred stock warrant liability, which represented a recurring measurement classified within Level 3 of the fair value hierarchy through the date of the IPO, wherein fair value was estimated using significant unobservable inputs (in thousands):

Beginning balance, January 1, 2014	$	297
Change in fair value		(50	)
Reclassification to additional paid-in capital		(247	)
Ending balance, September 30, 2014	$	—