Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2017

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, 2017 and December 31, 2016.

Fair value measurement as of June 30, 2017

Financial assets			Quoted prices in		Significant other		Significant
			active markets for		observable		unobservable
			identical assets		inputs		inputs
Type of Instrument	Total		(Level 1)		(Level 2)		(Level 3)
Cash and cash equivalents:
Money market fund and checking accounts	$	9,416	$	9,416	$	—	$	—
Available-for-sale marketable securities:
Money market fund		42,983		—		42,983		—
U.S. government agency obligations		7,998		—		7,998		—
Corporate bonds		26,889		—		26,889		—
Commercial paper		25,150		—		25,150		—
Restricted cash:
Commercial money market account		1,469		1,469		—		—
Total financial assets	$	113,905	$	10,885	$	103,020	$	—

Fair value measurement as of December 31, 2016:

Financial assets			Quoted prices in		Significant other		Significant
			active markets for		observable		unobservable
			identical assets		inputs		inputs
Type of Instrument	Total		(Level 1)		(Level 2)		(Level 3)
Cash and cash equivalents:
Money market fund and checking accounts	$	12,092	$	12,092	$	—	$	—
Available-for-sale marketable securities:
Money market fund		8,276		—		8,276		—
U.S. Treasury securities		2,522		—		2,522		—
U.S. government agency obligations		3,502		—		3,502		—
Corporate bonds		16,677		—		16,677		—
Commercial paper		15,207		—		15,207		—
Restricted cash:
Commercial money market account		1,469		1,469		—		—
Total financial assets	$	59,745	$	13,561	$	46,184	$	—