Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2016

Fair Value Disclosures [Abstract]

Schedule of Financial Assets and Liabilities Measured at Fair Value

The following tables present information about the Company’s financial assets and liabilities that have been measured at fair value as of December 31, 2016 and 2015, and indicates the fair value hierarchy of the valuation inputs utilized to determine such fair value (in thousands):

	December 31, 2016
	Level 1		Level 2		Level 3		Total
Money market funds	$	18,029	$	—	$	—	$	18,029
Corporate notes and obligations		—		33,840		—		33,840
U.S. government treasury securities		41,347		—		—		41,347
	$	59,376	$	33,840	$	—	$	93,216

	December 31, 2015
	Level 1		Level 2		Level 3			Total
Money market funds	$	8,015	$	—	$	—		$	8,015
Corporate notes and obligations		—		2,245		—			2,245
U.S. agency securities		—		3,015		—			3,015
U.S. government treasury securities		1,000		—		—			1,000
Preferred stock warrant liability		—		—		(414	)		(414	)
	$	9,015	$	5,260	$	(414	)	$	13,861

Schedule of Reconciliation of Preferred Stock Warrant Liability Measured at Fair Value Using Significant Unobservable Inputs

The followingtable presents a reconciliationofthe preferredstockwarrantliabilitymeasured at fairvalueusingsignificantunobservableinputs (in thousands):

Balance as of December 31, 2014	$	357
Changes in fair value of underlying warrant securities, recorded to interest expense		57
Balance as of December 31, 2015		414
Changes in fair value of underlying warrant securities, recorded to interest expense		202
Conversion of warrant, recorded to additional paid-in capital		(616	)
Balance as of December 31, 2016	$	—