Fair Value Measurement (Tables)

3 Months Ended

Mar. 31, 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):

	March 31, 2019
	Level 1		Level 2		Level 3		Total
Financial Assets
Money market funds	$	14,613	$	—	$	—	$	14,613
Reverse repurchase agreements		—		6,250		—		6,250
Commercial paper		—		42,931		—		42,931
U.S. government securities		—		1,119		—		1,119
Total financial assets	$	14,613	$	50,300	$	—	$	64,913

	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