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Summary of Significant Accounting Policies (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2022 USD ($) Institution	Dec. 31, 2021 USD ($)
Concentration of Credit Risk and Others Risks and Uncertainties [Abstract]
Number of financial institutions holding company's cash | Institution	2
Stock-Based Compensation [Abstract]
Option vesting term	4 years
Adjusted Cost, Gross Unrealized Gains, Gross Unrealized Losses and Fair Value of Financial Assets [Abstract]
Adjusted Cost	$ 165,356	$ 169,322
Fair Value	165,136	169,272
Cash [Member]
Adjusted Cost, Gross Unrealized Gains, Gross Unrealized Losses and Fair Value of Financial Assets [Abstract]
Adjusted Cost	31,449	35,428
Fair Value	31,449	35,428
Total Investment Securities [Member]
Adjusted Cost, Gross Unrealized Gains, Gross Unrealized Losses and Fair Value of Financial Assets [Abstract]
Adjusted Cost	133,907	133,894
Unrealized Gains	1	0
Unrealized Losses	(221)	(50)
Fair Value	133,687	133,844
Mutual Funds [Member]
Adjusted Cost, Gross Unrealized Gains, Gross Unrealized Losses and Fair Value of Financial Assets [Abstract]
Adjusted Cost	77,587	106,590
Unrealized Gains	0	0
Unrealized Losses	0	0
Fair Value	77,587	106,590
U. S. Agency Securities [Member]
Adjusted Cost, Gross Unrealized Gains, Gross Unrealized Losses and Fair Value of Financial Assets [Abstract]
Adjusted Cost	24,163	16,658
Unrealized Gains	0	0
Unrealized Losses	(124)	(26)
Fair Value	24,039	16,632
U.S. Treasury Securities [Member]
Adjusted Cost, Gross Unrealized Gains, Gross Unrealized Losses and Fair Value of Financial Assets [Abstract]
Adjusted Cost	32,157	10,646
Unrealized Gains	1	0
Unrealized Losses	(97)	(24)
Fair Value	$ 32,061	10,622
Minimum [Member]
Property and Equipment [Abstract]
Useful lives	5 years
Intangible Assets [Abstract]
Estimated useful lives	3 years
Maximum [Member]
Property and Equipment [Abstract]
Useful lives	7 years
Intangible Assets [Abstract]
Estimated useful lives	15 years
Recurring [Member]
Adjusted Cost, Gross Unrealized Gains, Gross Unrealized Losses and Fair Value of Financial Assets [Abstract]
Cash and Cash Equivalents	$ 136,408	142,018
Investments Available for Sale	28,728	27,254
Recurring [Member] | Cash [Member]
Adjusted Cost, Gross Unrealized Gains, Gross Unrealized Losses and Fair Value of Financial Assets [Abstract]
Cash and Cash Equivalents	31,449	35,428
Recurring [Member] | Level 1 [Member] | Total Investment Securities [Member]
Adjusted Cost, Gross Unrealized Gains, Gross Unrealized Losses and Fair Value of Financial Assets [Abstract]
Cash and Cash Equivalents	104,959	106,590
Investments Available for Sale	28,728	27,254
Recurring [Member] | Level 1 [Member] | Mutual Funds [Member]
Adjusted Cost, Gross Unrealized Gains, Gross Unrealized Losses and Fair Value of Financial Assets [Abstract]
Cash and Cash Equivalents	77,587	106,590
Investments Available for Sale	0	0
Recurring [Member] | Level 1 [Member] | U. S. Agency Securities [Member]
Adjusted Cost, Gross Unrealized Gains, Gross Unrealized Losses and Fair Value of Financial Assets [Abstract]
Cash and Cash Equivalents	5,352	0
Investments Available for Sale	18,687	16,632
Recurring [Member] | Level 1 [Member] | U.S. Treasury Securities [Member]
Adjusted Cost, Gross Unrealized Gains, Gross Unrealized Losses and Fair Value of Financial Assets [Abstract]
Cash and Cash Equivalents	22,020	0
Investments Available for Sale	$ 10,041	$ 10,622
Highly Liquid Debt Investments [Member] | Maximum [Member]
Investments [Abstract]
Contractual maturities of investment securities	2 years

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