Equity Investment in Unconsolidated Subsidiary - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands		9 Months Ended
	Nov. 07, 2019	Sep. 30, 2020
SPAC [Member]
Schedule Of Equity Method Investments [Line Items]
Amount raised through offering	$ 172,500
Shares sold in the offering	17,250,000
LGL Systems Acquisition Holdings Company, LLC [Member]
Schedule Of Equity Method Investments [Line Items]
Contribution to fund purchase of private warrants		$ 3,350
Percentage of risk capital contributed to effect IPO		62.20%
LGL Systems Acquisition Holdings Company, LLC [Member] | SPAC [Member]
Schedule Of Equity Method Investments [Line Items]
Percentage of sponsorship owned		20.00%
Class of warrants held		5,200,000
Warrant exercise/ strike price		$ 11.50
Number of restricted and non-tradeable shares held		4,312,500
LGL Systems Acquisition Holdings Company, LLC [Member] | Minimum [Member]
Schedule Of Equity Method Investments [Line Items]
Percentage of stockholders controlling a related party		10.00%