Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2019

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 March 31, 2019 and December 31, 2018.

Fair value measurement as of March 31, 2019:

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 funds and checking accounts	$	14,188	$	14,188	$	—	$	—
Available-for-sale marketable securities:
U.S. Treasury securities		15,937		—		15,937		—
U.S. government agency obligations		12,447		—		12,447		—
Corporate bonds		69,960		—		69,960		—
Commercial paper		38,108		—		38,108		—
Municipal bonds		5,500		—		5,500		—
Restricted cash:
Commercial money market account		769		769		—		—
Total financial assets	$	156,909	$	14,957	$	141,952	$	—

Fair value measurement as of December 31, 2018:

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 funds and checking accounts	$	15,081	$	15,081	$	—	$	—
Available-for-sale marketable securities:
U.S. Treasury securities		19,539		—		19,539		—
U.S. government agency obligations		17,859		—		17,859		—
Corporate bonds		75,910		—		75,910		—
Commercial paper		50,390		—		50,390		—
Municipal bonds		4,000		—		4,000		—
Restricted cash:
Commercial money market account		769		769		—		—
Total financial assets	$	183,548	$	15,850	$	167,698	$	—