Investments

12 Months Ended

Dec. 31, 2021

Investments, Debt and Equity Securities [Abstract]

Investments

4.Investments

Investments by security type consisted of the following at December 31, 2021 and December 31, 2020 (in thousands):

	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

	December 31, 2020
	Amortized Cost		Gross Unrealized Gain		Gross Unrealized Loss			Fair Value
Investments:
Commercial paper	$	12,343	$	—	$	—		$	12,343
Corporate bonds		68,333		8		(52	)	$	68,289
Certificate of deposits		2,272		—		—		$	2,272
Government securities		104,491		6		(9	)		104,488
	$	187,439	$	14	$	(61	)	$	187,392

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 table above is a restricted investment of $1,400 as the cost approximates current fair value.

The amortized cost and fair value of investments in commercial paper, corporate bonds, certificates of deposit 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

The amortized cost and fair value of investments in commercial paper, corporate bonds, certificates of deposit and government securities by contractual maturity, as of December 31, 2020 were as follows (in thousands):

	Available-for-Sale
	Cost		Fair Value
Due in 1-year or less	$	137,588	$	137,567
Due after 1-year through 5-years		49,851		49,825
	$	187,439	$	187,392