Fair Value Measurement (Tables)

6 Months Ended

Jun. 30, 2019

Fair Value Disclosures [Abstract]

Financial Assets and Liabilities Measured at Fair Value on Recurring Basis

The following tables sets forth the fair value of the Company’s financial assets and liabilities at fair value on a recurring basis based on the three-tier fair value hierarchy (in thousands):

	June 30, 2019
	Level 1		Level 2		Level 3		Total
Financial Assets
Money market funds	$	5,947	$	—	$	—	$	5,947
Reverse repurchase agreements		—		6,250		—		6,250
Commercial paper		—		49,435		—		49,435
U.S. government securities		—		38,666		—		38,666
Total financial assets	$	5,947	$	94,351	$	—	$	100,298

	December 31, 2018
	Level 1		Level 2		Level 3		Total
Financial Assets
Money market funds	$	7,180	$	—	$	—	$	7,180
Reverse repurchase agreements		—		6,250		—		6,250
Commercial paper		—		53,916		—		53,916
U.S. government securities		—		4,112		—		4,112
Total financial assets	$	7,180	$	64,278	$	—	$	71,458