Short-Term Investments (Tables)

3 Months Ended

Mar. 31, 2021

Investments Debt And Equity Securities [Abstract]

Summary of Amortized Cost and Estimated Fair Value of Marketable Securities

The following tables summarize the amortized cost and estimated fair value of the Company’s marketable securities, which are considered to be available-for-sale investments and were included in short-term investments on the condensed consolidated balance sheets:

	March 31, 2021
(in thousands)	Amortized Cost		Unrealized Gains		Unrealized Losses		Fair Value
U.S. government treasury securities		168,329		18		—		168,347
Totals	$	168,329	$	18	$	—	$	168,347

	December 31, 2020
(in thousands)	Amortized Cost		Unrealized Gains		Unrealized Losses			Fair Value
U.S. government treasury securities	$	233,687		—	$	(24	)	$	233,663
Totals	$	233,687	$	0	$	(24	)	$	233,663