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Condensed Consolidated Statements of Stockholder's Equity (Unaudited) (Parenthetical) $ in Thousands | 3 Months Ended
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Mar. 31, 2020 USD ($)
Statement Of Stockholders Equity [Abstract] |
Stock issuance costs | $ 346

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- Definition Stock issuance costs. + References No definition available. + Details
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Namespace Prefix: | lgl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_StatementOfStockholdersEquityAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration