Fair Value of Financial Instruments (Tables)

6 Months Ended

Jun. 30, 2019

Fair Value Disclosures [Abstract]

Schedule of Fair Value Measurement

The following tables represent the financial instruments measured at fair value on a recurring basis in the financial statements of the Company and the valuation approach applied to each class of financial instruments at June 30, 2019 and December 31, 2018 (in thousands):

	June 30, 2019
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
Assets:
Cash and cash equivalents:
Money market funds	$	75,672	$	—	$	—	$	75,672
Commercial paper	—		2,394		—		2,394
Asset-backed securities	—		1,199		—		1,199
Corporate notes and bonds	—		1,206		—		1,206
Total cash and cash equivalents	$	75,672	$	4,799	$	—	$	80,471
Investments:
Certificates of deposit	—		6,881		—		6,881
U.S. Treasury securities	21,011		—		—		21,011
U.S. Agency securities	—		4,008		—		4,008
Commercial paper	—		6,080		—		6,080
Corporate notes and bonds	—		12,369		—		12,369
Total investments	21,011		29,338		—		50,349
Total assets measured at fair value	$	96,683	$	34,137	$	—	$	130,820

	December 31, 2018
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
Assets:
Cash and cash equivalents:
Money market funds	$	38,444	$	—	$	—	$	38,444
Commercial paper	—		1,493		—		1,493
Total cash and cash equivalents	38,444		1,493		—		39,937
Investments:
Certificates of deposit	—		10,787		—		10,787
U.S. Treasury securities	22,120		—		—		22,120
U.S. Agency securities	—		7,980		—		7,980
Commercial paper	—		17,025		—		17,025
Asset-backed securities	—		11,998		—		11,998
Corporate notes and bonds	—		30,308		—		30,308
Total investments	22,120		78,098		—		100,218
Total assets measured at fair value	$	60,564	$	79,591	$	—	$	140,155