Short-Term Investments

3 Months Ended

Mar. 31, 2022

Investments, Debt and Equity Securities [Abstract]

Short-Term Investments

3. Short-Term Investments

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, 2022
(in thousands)	Amortized Cost		Unrealized Gains		Unrealized Losses			Fair Value
U.S. government treasury securities	$	85,052	$	—	$	(214	)	$	84,838
Marketable securities:
Commercial paper		5,573		—		(2	)		5,571
Corporate bonds		10,767		—		(7	)		10,760
Totals	$	101,392	$	—	$	(223	)	$	101,169

	December 31, 2021
(in thousands)	Amortized Cost		Unrealized Gains		Unrealized Losses			Fair Value
U.S. government treasury securities	$	25,092	$	—	$	(20	)	$	25,072
Marketable securities:
Commercial paper		11,568		1		—			11,569
Corporate bonds		9,821		—		(3	)		9,818
Totals	$	46,481	$	1	$	(23	)	$	46,459

Certain short-term debt securities with original maturities of less than three months are included in cash and cash equivalents on the condensed consolidated balance sheets and are not included in the tables above. At March 31, 2022 and December 31, 2021, all investments had contractual maturities within one year.