Equity Investment in Unconsolidated Subsidiary - Additional Information (Details) - USD ($)			12 Months Ended
	Sep. 14, 2021	Nov. 30, 2019	Dec. 31, 2021	Dec. 31, 2020
Schedule Of Equity Method Investments [Line Items]
Contribution to fund purchase of private warrants		$ 3,350,000
Proceeds from subscription of investment		$ 2,725,000
Common stock, shares outstanding (in shares)			5,308,973	5,272,204
Warrant			2,065,000
IronNet [Member]
Schedule Of Equity Method Investments [Line Items]
Common stock, shares outstanding (in shares)	1,572,529
Fair value	$ 65,300,000
Equity losses			$ 59,453,000	$ 262,000
Cumulative loss on investments			$ 59,175,000
IronNet [Member] | Private Warrants [Member]
Schedule Of Equity Method Investments [Line Items]
Warrant	2,065,000