Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2020

Fair Value Disclosures [Abstract]

Company's Available-for-Sale Securities by Level within Fair Value Hierarchy

The Company’s investments by level within the fair value hierarchy were as follows (in thousands):

Type of securities as of December 31, 2020	Fair value measurement using:
	Level 1		Level 2		Level 3		Total
Cash equivalents:
Money market fund	$	400,757	$	—	$	—	$	400,757
Short-term investments:
Corporate debt securities	—		22,409		—		22,409
U.S. government-related debt securities	—		5,003		—		5,003
Asset-backed securities	—		1,471		—		1,471
Total	$	400,757	$	28,883	$	—	$	429,640

Type of securities as of December 31, 2019	Fair value measurement using:
	Level 1		Level 2		Level 3		Total
Cash equivalents:
Money market fund	$	22,152	$	—	$	—	$	22,152
Short-term investments:
Corporate debt securities	—		78,330		—		78,330
U.S. government-related debt securities	—		27,003		—		27,003
Asset-backed securities	—		11,971		—		11,971
Corporate equity securities	10,518		—		—		10,518
Total	$	32,670	$	117,304	$	—	$	149,974