Summary of Significant Accounting Policies (Tables)

9 Months Ended

Sep. 30, 2022

Summary of Significant Accounting Policies [Abstract]

Adjusted Cost, Gross Unrealized Gains, Gross Unrealized Losses and Fair Value of Financial Assets

The following tables show the adjusted cost, gross unrealized gains, gross unrealized losses, and fair value of our securities by significant investment category as of September 30, 2022 and December 31, 2021.

	September 30, 2022
	Adjusted Cost		Unrealized Gains		Unrealized Losses			Fair Value		Cash and Cash Equivalents		Investments Available for Sale
Cash	$	24,921	$	—	$	—		$	24,921	$	24,921	$	—
Level 1:
Mutual funds		65,437		—		—			65,437		65,437		—
U.S. agency securities		40,127		2		(312	)		39,817		10,450		29,367
U.S. treasury securities		28,998		1		(174	)		28,825		4,997		23,828
		134,562		3		(486	)		134,079		80,884		53,195
Total	$	159,483	$	3	$	(486	)	$	159,000	$	105,805	$	53,195

	December 31, 2021
	Adjusted Cost		Unrealized Gains		Unrealized Losses			Fair Value		Cash and Cash Equivalents		Investments Available for Sale
Cash	$	35,428	$	—	$	—		$	35,428	$	35,428	$	—
Level 1:
Mutual funds		106,590		—		—			106,590		106,590		—
U.S. agency securities		16,658		—		(26	)		16,632		—		16,632
U.S. treasury securities		10,646		—		(24	)		10,622		—		10,622
		133,894		—		(50	)		133,844		106,590		27,254
Total	$	169,322	$	-	$	(50	)	$	169,272	$	142,018	$	27,254