Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2020

Fair Value Disclosures [Abstract]

Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis

The following tables summarize the assets measured at fair value on a recurring basis (in thousands):

	March 31, 2020
	Total		Level 1		Level 2
Assets
Cash and cash equivalents:
Cash	$	5,488	$	5,488	$	—
Money market funds	199,017		199,017		—
Total cash and cash equivalents	204,505		204,505		—
Short-term investments:
U.S. Treasury bills	25,232		25,232		—
Corporate debt securities	227,726		—		227,726
Commercial paper	193,030		—		193,030
U.S. Agency bonds	44,867		—		44,867
Total short-term investments	490,855		25,232		465,623
Total	$	695,360	$	229,737	$	465,623

	December 31, 2019
	Total		Level 1		Level 2
Assets
Cash and cash equivalents:
Cash	$	662	$	662	$	—
Money market funds	45,873		45,873		—
Total cash and cash equivalents	46,535		46,535		—
Short-term investments:
U.S. Treasury bills	36,500		36,500		—
Corporate debt securities	160,297		—		160,297
Commercial paper	120,936		—		120,936
U.S. Agency bonds	50,782		—		50,782
Total short-term investments	368,515		36,500		332,015
Total	$	415,050	$	83,035	$	332,015