XML 69 R58.htm IDEA: XBRL DOCUMENT
v3.21.2

Subsequent Events - Additional Information (Details) $ in Millions |  |  |  | 3 Months Ended
--- | --- | --- | --- | ---
Oct. 31, 2021 USD ($) shares | Oct. 05, 2021 Tranche shares | Oct. 01, 2021 shares | Mar. 31, 2020 shares
Common Stock [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Shares sold |  |  |  | 263,725
Subsequent Events [Member] | IronNet [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Number of tranches, common shares received upon exercise of warrants | Tranche |  | 2 |  |
Deferred tax assets related to net operating loss and tax credit carryforwards | $ | $ 2.5 |  |  |
Subsequent Events [Member] | IronNet [Member] | Private Warrants [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Warrants exercised |  |  | 2,065,000 |
Subsequent Events [Member] | IronNet [Member] | Common Stock [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Shares sold | 1,405,315 |  | 220,000 |
Common shares received upon exercise of warrants |  | 1,271,406 |  |
Gross pre-tax proceeds from shares sold | $ | $ 16.9 |  |  |
Unrestricted shares held | 138,620 |  |  |
Restricted shares held | 1,250,000 |  |  |

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 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 Number of tranches, common shares received upon exercise of warrants. + References No definition available. + Details
Name: | lgl_NumberOfTranchesCommonSharesReceivedUponExerciseOfWarrants
Namespace Prefix: | lgl_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32632-109319 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32621-109319 + Details
Name: | us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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
- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
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_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
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: |