Summary of Significant Accounting Policies (Tables)

6 Months Ended

Jun. 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 June 30, 2022 and December 31, 2021.

	June 30, 2022
	Adjusted Cost		Unrealized Gains		Unrealized Losses			Fair Value		Cash and Cash Equivalents		Investments Available for Sale
Cash	$	27,934	$	—	$	—		$	27,934	$	27,934	$	—
Level 1:
Mutual funds		64,782		—		—			64,782		64,782		—
U.S. agency securities		46,341		1		(211	)		46,131		21,975		24,156
U.S. treasury securities		22,934		3		(124	)		22,813		12,487		10,326
		134,057		4		(335	)		133,726		99,244		34,482
Total	$	161,991	$	4	$	(335	)	$	161,660	$	127,178	$	34,482

	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