Investments (Tables)

12 Months Ended

Dec. 31, 2020

Investments, Debt and Equity Securities [Abstract]

Schedule of Short-Term Investments

The following tables summarize the Company's short-term investments (in thousands):

		As of December 31, 2020
	Maturity	Amortized cost		Gross unrealized gains		Gross unrealized losses		Estimated fair value
Corporate debt securities	2 years or less	$	130,814	$	160	$	(4)	$	130,970
Commercial paper	1 year or less	240,725		58		(18)		240,765
U.S. Agency bonds	2 years or less	83,227		37		(1)		83,263
U.S. Treasury bills	2 years or less	49,539		10		(3)		49,546
		$	504,305	$	265	$	(26)	$	504,544

		As of December 31, 2019
	Maturity	Amortized cost		Gross unrealized gains		Gross unrealized losses		Estimated fair value
Corporate debt securities	2 years or less	$	160,065	$	233	$	(1)	$	160,297
Commercial paper	1 year or less	120,862		74		—		120,936
U.S. Agency bonds	2 years or less	50,745		41		(4)		50,782
U.S. Treasury bills	2 years or less	36,474		27		(1)		36,500
		$	368,146	$	375	$	(6)	$	368,515