Equity Investment in Unconsolidated Subsidiary	12 Months Ended
Dec. 31, 2021
Equity Method Investments And Joint Ventures [Abstract]
Equity Investment in Unconsolidated Subsidiary	C. Equity Investment in Unconsolidated Subsidiary In November 2019, the Company made its initial investment of $3.35 million in the Sponsor of the SPAC and subscribed to an additional investment of $2.725 million in March 2021. The incremental investment was part of the Sponsor syndication to participate in a private placement (“PIPE”) in connection with the IronNet Business Combination. On September 14, 2021, as a result of its Sponsor investment, the Company received 1,572,529 shares of IRNT common stock and 2,065,000 IRNT private warrants exchangeable into shares of IRNT common stock, representing an aggregate fair value of $65.3 million. While LGL continues to hold an interest in the Sponsor, it is immaterial. See Note D - Marketable Securities for the basis of determining the fair value of the securities received. For the years ended December 31, 2021 and 2020, the Company recognized a gain (loss) on equity investment in unconsolidated subsidiary of $59,453,000 and ($262,000), respectively, for its share of the Sponsor’s gains and losses through the September 14, 2021 distribution of IRNT common stock and private warrants. The Company has recognized a cumulative gain of $59,175,000 on its investment in the unconsolidated Sponsor through December 31, 2021. Subsequent to the September 14, 2021 Sponsor distribution, the Company’s IRNT securities held have been classified as marketable securities, under ASC 321, Investments – Equity Securities (“ASC 321”), with the change in fair value of period end holdings reported as an unrealized gain or loss. On April 12, 2021, the SEC’s Staff Statement on Accounting and Reporting Considerations for Warrants Issued by Special Purpose Acquisition Companies (the “Staff Statement”) was released. The SPAC evaluated the applicability and impact of the Staff Statement on its historical financial statements that have been filed with the SEC and determined that restatement was required. In the first quarter of 2021, the SPAC changed its accounting treatment for both its public and private warrants outstanding using liability classification instead of equity classification resulting in a mark to market warrant liability adjustment for each reporting period since issuance in 2019. Prior to the IronNet Business Combination, the Company reported its investment in the Sponsor under the equity method of accounting using hypothetical liquidation book value (“HLBV”). The SPAC’s mark to market accounting adjustments for the warrant liability did not change the Company’s HLBV due to the warrants requiring no cash settlement as of December 31, 2020 under a hypothetical liquidation; therefore, the SPAC’s restatement did not impact the Company’s carrying amount of its equity investment in the Sponsor.

Equity Investment in Unconsolidated Subsidiary

12 Months Ended

Dec. 31, 2021

Equity Method Investments And Joint Ventures [Abstract]

Equity Investment in Unconsolidated Subsidiary

C. Equity Investment in Unconsolidated Subsidiary

In November 2019, the Company made its initial investment of $3.35 million in the Sponsor of the SPAC and subscribed to an additional investment of $2.725 million in March 2021. The incremental investment was part of the Sponsor syndication to participate in a private placement (“PIPE”) in connection with the IronNet Business Combination.

On September 14, 2021, as a result of its Sponsor investment, the Company received 1,572,529 shares of IRNT common stock and 2,065,000 IRNT private warrants exchangeable into shares of IRNT common stock, representing an aggregate fair value of $65.3 million. While LGL continues to hold an interest in the Sponsor, it is immaterial. See Note D - Marketable Securities for the basis of determining the fair value of the securities received.

For the years ended December 31, 2021 and 2020, the Company recognized a gain (loss) on equity investment in unconsolidated subsidiary of $59,453,000 and ($262,000), respectively, for its share of the Sponsor’s gains and losses through the September 14, 2021 distribution of IRNT common stock and private warrants. The Company has recognized a cumulative gain of $59,175,000 on its investment in the unconsolidated Sponsor through December 31, 2021.

Subsequent to the September 14, 2021 Sponsor distribution, the Company’s IRNT securities held have been classified as marketable securities, under ASC 321, Investments – Equity Securities (“ASC 321”), with the change in fair value of period end holdings reported as an unrealized gain or loss.

On April 12, 2021, the SEC’s Staff Statement on Accounting and Reporting Considerations for Warrants Issued by Special Purpose Acquisition Companies (the “Staff Statement”) was released. The SPAC evaluated the applicability and impact of the Staff Statement on its historical financial statements that have been filed with the SEC and determined that restatement was required. In the first quarter of 2021, the SPAC changed its accounting treatment for

both its public and private warrants outstanding using liability classification instead of equity classification resulting in a mark to market warrant liability adjustment for each reporting period since issuance in 2019. Prior to the IronNet Business Combination, the Company reported its investment in the Sponsor under the equity method of accounting using hypothetical liquidation book value (“HLBV”). The SPAC’s mark to market accounting adjustments for the warrant liability did not change the Company’s HLBV due to the warrants requiring no cash settlement as of December 31, 2020 under a hypothetical liquidation; therefore, the SPAC’s restatement did not impact the Company’s carrying amount of its equity investment in the Sponsor.