Investments

12 Months Ended

Dec. 31, 2022

Investments, Debt and Equity Securities [Abstract]

Investments

4.Investments

Investments by security type consisted of the following at December 31, 2022 and 2021 (in thousands):

	December 31, 2022
	Amortized Cost		Gross Unrealized Gain		Gross Unrealized Loss			Fair Value
Investments:
Commercial paper	$	2,465	$	—	$	—		$	2,465
Corporate bonds		2,958		—		(1	)		2,957
Government securities		12,898		3		(12	)		12,889
	$	18,321	$	3	$	(13	)	$	18,311

	December 31, 2021
	Amortized Cost		Gross Unrealized Gain		Gross Unrealized Loss			Fair Value
Investments:
Commercial paper	$	6,250	$	—	$	—		$	6,250
Corporate bonds		40,123		—		(28	)		40,095
Government securities		64,885		—		(31	)		64,854
	$	111,258	$	—	$	(59	)	$	111,199

Investments with original maturities of less than 90 days are included in cash and cash equivalents on the consolidated balance sheets and are not included in the table above. Investments with maturities of less than twelve months are considered current assets and those investments with maturities greater than twelve months are considered non-current assets.

Excluded from the tables above at December 31, 2022 and 2021 are restricted investments of $1,401, as the cost approximates current fair value.

The amortized cost and fair value of investments in commercial paper, corporate bonds, and government securities by contractual maturity, as of December 31, 2022 and were as follows (in thousands):

	Available-for-Sale
	Cost		Fair Value
Due in 1-year or less	$	18,321	$	18,311
Due after 1-year through 5-years		—		—
	$	18,321	$	18,311

The amortized cost and fair value of investments in commercial paper, corporate bonds, and government securities by contractual maturity, as of December 31, 2021 were as follows (in thousands):

	Available-for-Sale
	Cost		Fair Value
Due in 1-year or less	$	110,762	$	110,704
Due after 1-year through 5-years		496		495
	$	111,258	$	111,199