Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2019

Fair Value Disclosures [Abstract]

Schedule of Financial Assets Measured at Fair Value on Recurring Basis

Financial assets measured at fair value on a recurring basis as of June 30, 2019 and December 31, 2018 were as follows (in thousands):

	As of June 30, 2019
	Level 1		Level 2		Level 3		Total
Investment securities:
U.S. government and agency obligations	$	23,405	$	18,168	$	—	$	41,573
Certificates of deposit		—		5,961		—		5,961
Commercial paper		—		24,603		—		24,603
Corporate debt securities		—		13,121		—		13,121
Total assets measured at fair value	$	23,405	$	61,853	$	—	$	85,258

	As of December 31, 2018
	Level 1		Level 2		Level 3		Total
Investment securities:
U.S. government and agency obligations	$	22,275	$	19,989	$	—	$	42,264
Certificates of deposit		—		5,408		—		5,408
Commercial paper		—		47,686		—		47,686
Corporate debt securities		—		23,544		—		23,544
Total assets measured at fair value	$	22,275	$	96,627	$	—	$	118,902