XML 54 R41.htm IDEA: XBRL DOCUMENT
v3.22.1

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 |  |  |

X
- Definition Class of warrant or right exercised. + References No definition available. + Details
Name: | lgl_ClassOfWarrantOrRightExercised
Namespace Prefix: | lgl_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Common shares received upon exercise of warrants. + References No definition available. + Details
Name: | lgl_CommonSharesReceivedUponExerciseOfWarrants
Namespace Prefix: | lgl_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Distribution of shares by sponsor. + References No definition available. + Details
Name: | lgl_DistributionOfSharesBySponsor
Namespace Prefix: | lgl_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Distribution of shares by sponsor subject to certain founder share non-restrictions. + References No definition available. + Details
Name: | lgl_DistributionOfSharesBySponsorSubjectToCertainFounderShareNonRestrictions
Namespace Prefix: | lgl_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Distribution of shares by sponsor subject to certain founder share restrictions. + References No definition available. + Details
Name: | lgl_DistributionOfSharesBySponsorSubjectToCertainFounderShareRestrictions
Namespace Prefix: | lgl_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Fair value of shares recognized, expenses. + References No definition available. + Details
Name: | lgl_FairValueOfSharesRecognizedExpenses
Namespace Prefix: | lgl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Number of shares issued as charitable gift. + References No definition available. + Details
Name: | lgl_NumberOfSharesIssuedAsCharitableGift
Namespace Prefix: | lgl_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of shares issued by sponsor. + References No definition available. + Details
Name: | lgl_NumberOfSharesIssuedBySponsor
Namespace Prefix: | lgl_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_MarketableSecuritiesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of realized gain (loss) on investment in marketable security, including other-than-temporary impairment (OTTI). + References No definition available. + Details
Name: | us-gaap_MarketableSecuritiesRealizedGainLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of unrealized gain (loss) on investment in marketable security. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(7)(c)) -URI http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227 + Details
Name: | us-gaap_MarketableSecuritiesUnrealizedGainLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The cash inflow associated with the amount received from entity's first offering of stock to the public. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3255-108585 + Details
Name: | us-gaap_ProceedsFromIssuanceInitialPublicOffering
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Number of new stock issued during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=123467817&loc=d3e21463-112644 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_StockIssuedDuringPeriodSharesNewIssues
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_StatementEquityComponentsAxis=us-gaap_CommonStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=lgl_IronNetMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementEquityComponentsAxis=lgl_PrivateWarrantMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=lgl_PrivateWarrantMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=lgl_LGLSystemsAcquisitionHoldingsCompanyLLCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_CommonStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=lgl_PIPERelatedCommonSharesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=lgl_PutOptionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |