Equity Investment in Unconsolidated Subsidiary - Additional Information (Details) - USD ($)			6 Months Ended
	Sep. 14, 2021	Nov. 30, 2019	Mar. 31, 2022	Dec. 31, 2021	Oct. 01, 2021	Mar. 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)			5,323,973	5,308,973
Common Stock [Member]
Schedule Of Equity Method Investments [Line Items]
Common stock, shares outstanding (in shares)			5,323,973	5,308,973		5,272,204	5,272,204
IronNet [Member]
Schedule Of Equity Method Investments [Line Items]
Common stock, shares outstanding (in shares)	1,572,529
Fair value	$ 65,300,000
IronNet [Member] | Common Stock [Member]
Schedule Of Equity Method Investments [Line Items]
Common stock, shares outstanding (in shares)			1,288,620		2,843,935
Common shares received upon exercise of warrants					1,271,406
Shares disposed			1,555,315
Received related proceeds of common stock			$ 19,000,000
Private Warrants [Member] | IronNet [Member]
Schedule Of Equity Method Investments [Line Items]
Warrant	2,065,000
Warrants exercised					2,065,000