Cash Equivalents and Short-Term Investments

3 Months Ended

Mar. 31, 2022

Cash and Cash Equivalents [Abstract]

Cash Equivalents and Short-Term Investments

Cash Equivalents and Short-Term Investments

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

	March 31, 2022
(in thousands)	Amortized Cost		Unrealized Gain		Unrealized Loss		Estimated Fair Value
Cash equivalents
Money market funds	$	156,230	$	—	$	—	$	156,230
Total cash equivalents	$	156,230	$	—	$	—	$	156,230
Short-term investments
Commercial paper	$	111,521	$	—	$	(297)	$	111,224
Corporate bonds	37,339		—		(252)		37,087
Asset backed securities	26,358		—		(190)		26,168
Certificates of deposit	20,000		—		(37)		19,963
Supranational bonds	8,599		—		(107)		8,492
U.S. Treasury and agency obligations	36,191		—		(480)		35,711
Total short-term investments	$	240,008	$	—	$	(1,363)	$	238,645

	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

We considered the extent to which any unrealized losses on our short-term investments were driven by credit risk and other factors, including market risk, and if it is more-likely-than-not that we would have to sell the securities before the recovery of the amortized cost basis. At March 31, 2022, our unrealized losses were due to rising market interest rates compared to when the investments were initiated. We do not believe any unrealized losses represent credit losses, and it is unlikely we would sell the investments before we would recover their amortized cost basis.

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

	March 31, 2022
(in thousands)	Amortized Cost		Estimated Fair Value
Due within one year	$	214,808	$	213,966
Due between one and two years	25,200		24,679
Total short-term investments	$	240,008	$	238,645

At March 31, 2022 and December 31, 2021, cash and cash equivalents included $5.8 million of restricted cash primarily related to collateral for our outstanding letters of credit and excluded $0.3 million of restricted cash related to an account established as collateral for a lease arrangement, which is included in other assets on the consolidated balance sheets.