Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2021

Fair Value Disclosures [Abstract]

Fair Value, Assets Measured on Recurring Basis

The following table summarizes our financial assets measured at fair value on a recurring basis (in thousands):

	June 30, 2021
	Total		Level 1		Level 2		Level 3
Financial Assets:
Money market funds	$	358,206	$	358,206	$	—	$	—
Corporate debt securities		11,272		—		11,272		—
U.S. government agency securities		1,800		—		1,800		—
U.S. government securities		5,013		—		5,013		—
Total financial assets	$	376,291	$	358,206	$	18,085	$	—
	December 31, 2020
	Total		Level 1		Level 2		Level 3
Financial Assets:
Money market funds	$	486,174	$	486,174	$	—	$	—
Corporate debt securities		29,804		—		29,804		—
U.S. government agency securities		15,943		—		15,943		—
Certificates of deposits		243		—		243		—
U.S. government securities		20,136		—		20,136		—
Total financial assets	$	552,300	$	486,174	$	66,126	$	—