Marketable Securities - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Oct. 01, 2021	Sep. 14, 2021
Marketable Securities [Line Items]
Realized (loss) income on marketable securities	$ (16,962,000)	$ 74,000
Unrealized (loss) gain on marketable securities	$ (22,949,000)	$ 139,000
Common Stock [Member]
Marketable Securities [Line Items]
Shares sold		263,725
IronNet [Member] | Private Warrants [Member]
Marketable Securities [Line Items]
Warrants exercised			2,065,000
IronNet [Member] | Common Stock [Member]
Marketable Securities [Line Items]
Distribution of shares by sponsor subject to certain founder share restrictions	1,250,000
Common shares received upon exercise of warrants			1,271,406
Shares sold	1,455,315
Pre-tax proceeds from shares sold	$ 18,548,000
Unrestricted shares held	88,620
IronNet [Member] | Private Warrants [Member]
Marketable Securities [Line Items]
Distribution of shares by sponsor	2,065,000
IronNet [Member] | Private Warrants [Member] | LGL Systems Acquisition Holdings Company, LLC [Member]
Marketable Securities [Line Items]
Distribution of shares by sponsor				2,065,000
IronNet [Member] | Common Stock [Member]
Marketable Securities [Line Items]
Distribution of shares by sponsor	1,250,000
Distribution of shares by sponsor subject to certain founder share restrictions	1,300,000
Distribution of shares by sponsor after charitable contribution	50,000
Fair value of shares recognized, expense	$ 1,318,000
IronNet [Member] | Common Stock [Member] | LGL Systems Acquisition Holdings Company, LLC [Member]
Marketable Securities [Line Items]
Distribution of shares by sponsor				1,572,529
IronNet [Member] | PIPE Related Common Shares [Member]
Marketable Securities [Line Items]
Distribution of shares by sponsor	272,529
IronNet [Member] | Put Options
Marketable Securities [Line Items]
Unrealized (loss) gain on marketable securities	$ 756,000
IronNet [Member] | Put Options | Common Stock [Member]
Marketable Securities [Line Items]
Shares issued by sponsor	300,000