Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2021

Fair Value Disclosures [Abstract]

Schedule of Assets Measured at Fair Value on Recurring Basis

Following are the major categories of assets measured at fair value on a recurring basis as of March 31, 2021 and December 31, 2020 (in thousands):

	Fair Value Measurement at End of Period Using:
	Fair Value		Quoted Market Price for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
At March 31, 2021
Money market funds (1)	$	104,208	$	104,208	$	—	$	—	$	104,208
U.S. treasury securities		173,933		173,933		—		—		173,933
Total	$	278,141	$	278,141	$	—	$	—	$	278,141
At December 31, 2020
Money market funds (1)	$	78,446	$	78,446	$	—	$	—	$	78,446
U.S. treasury securities		215,154		215,154		—		—		215,154
Total	$	293,600	$	293,600	$	—	$	—	$	293,600

⁽¹⁾ Included in cash and cash equivalents in accompanying balance sheets.