Equity Investment in Unconsolidated Subsidiary - Additional Information (Details) - LGL Systems Acquisition Holdings Company, LLC [Member] - USD ($)			12 Months Ended
	Nov. 12, 2019	Nov. 06, 2019	Dec. 31, 2020	Dec. 31, 2019
Schedule Of Equity Method Investments [Line Items]
Contribution to fund purchase of private warrants		$ 3,350,000
Percentage of risk capital contributed to effect IPO		62.20%
Number of restricted and non-tradeable shares held		5,200,000
Equity losses			$ 262,000	$ 16,000
Cumulative loss on investments			$ 278,000
SPAC [Member]
Schedule Of Equity Method Investments [Line Items]
Percentage of sponsorship owned	20.00%
Class of warrants held	5,200,000
SPAC [Member] | SPAC [Member]
Schedule Of Equity Method Investments [Line Items]
Amount raised through offering	$ 172,500,000
Private Placement [Member]
Schedule Of Equity Method Investments [Line Items]
Warrant exercise/ strike price		$ 11.50
Common Class B [Member]
Schedule Of Equity Method Investments [Line Items]
Percentage of sponsorship owned		100.00%
Common Stock [Member] | Private Placement [Member]
Schedule Of Equity Method Investments [Line Items]
Warrant exercisable to purchase common stock		1