As of September 30, 2023, the Company held restricted investments of $1,401, the cost of which approximates current fair value. The Company did not hold any other investments as of September 30, 2023.

Investments by security type consisted of the following at December 31, 2022 (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

Excluded from the table above are restricted investments of $1,401, as the cost approximated fair value as of December 31, 2022. Investments with original maturities of less than 90 days are included in cash and cash equivalents on the condensed consolidated balance sheets and are not included in the table above. Investments with maturities of less than 12 months are considered current assets and those investments with maturities greater than 12 months are considered non-current assets. As of December 31, 2022, all of the Company’s investments were classified as available-for-sale and mature within 12 months of the balance sheet date.