Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 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):

	June 30, 2020
	Total		Level 1		Level 2
Assets
Cash and cash equivalents:
Cash	$	12,198	$	12,198	$	—
Money market funds	119,491		119,491		—
Total cash and cash equivalents	131,689		131,689		—
Short-term investments:
U.S. Treasury bills	63,462		63,462		—
Corporate debt securities	178,288		—		178,288
Commercial paper	233,889		—		233,889
U.S. Agency bonds	38,382		—		38,382
Total short-term investments	514,021		63,462		450,559
Total	$	645,710	$	195,151	$	450,559

	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