Cash Equivalents and Short-Term Investments (Tables)

12 Months Ended

Dec. 31, 2021

Cash and Cash Equivalents [Abstract]

Summary of debt securities

The following tables summarize the amortized cost, unrealized gain and loss and estimated fair value of cash equivalents and short-term investments:

	December 31, 2021
(in thousands)	Amortized Cost		Unrealized Gain		Unrealized Loss		Estimated Fair Value
Cash equivalents:
Money market funds	$	178,518	$	—	$	—	$	178,518
Total cash equivalents	$	178,518	$	—	$	—	$	178,518
Short-term investments:
Commercial paper	$	134,165	$	—	$	(47)	$	134,118
Corporate bonds	27,169		—		(41)		27,128
Asset backed securities	27,464		—		(53)		27,411
Certificates of deposit	10,000		—		(8)		9,992
Supranational bonds	8,632		—		(33)		8,599
U.S. Treasury and agency obligations	27,168		—		(124)		27,044
Total short-term investments	$	234,598	$	—	$	(306)	$	234,292

	December 31, 2020
(in thousands)	Amortized Cost		Unrealized Gain		Unrealized Loss		Estimated Fair Value
Cash equivalents:
Money market funds	$	44,153	$	—	$	—	$	44,153
Commercial paper	4,500		—		—		4,500
Total cash equivalents	$	48,653	$	—	$	—	$	48,653
Short-term investments:
Commercial paper	$	71,425	$	—	$	—	$	71,425
Corporate bonds	4,502		3		—		4,505
U.S. Treasury and agency obligations	37,686		7		—		37,693
Total short-term investments	$	113,613	$	10	$	—	$	113,623

Schedule of contractual maturities of short-term investments

The contractual maturities of our short-term investments are as follows:

	December 31, 2021				December 31, 2020
(in thousands)	Amortized Cost		Estimated Fair Value		Amortized Cost		Estimated Fair Value
Due within one year	$	195,579	$	195,453	$	113,613	$	113,623
Due between one and four years	39,019		38,839		—		—
Total short-term investments	$	234,598	$	234,292	$	113,613	$	113,623