XML 70 R59.htm IDEA: XBRL DOCUMENT v3.21.2

Subsequent Events - Schedule of Sponsor Transactions (Details) - USD ($) $ in Thousands			3 Months Ended
	Oct. 31, 2021	Oct. 01, 2021	Mar. 31, 2020	Sep. 30, 2021	Sep. 28, 2021	Sep. 14, 2021	Dec. 31, 2020
Subsequent Event [Line Items]
Sponsor investment				$ 50,828			$ 5,791
Common Stock [Member]
Subsequent Event [Line Items]
Shares sold			(263,725)
IronNet [Member]
Subsequent Event [Line Items]
Sponsor investment				$ 6,100
IronNet [Member] | Common Stock [Member]
Subsequent Event [Line Items]
Sponsor distribution						1,572,529
Shares donated					(50,000)
IronNet [Member] | Subsequent Events [Member] | Common Stock [Member]
Subsequent Event [Line Items]
Cashless exercise of warrants		(1,271,406)
Shares sold	(1,405,315)	(220,000)
Gross pre-tax proceeds from shares sold	$ 16,900
Remaining shares	1,388,620
Restricted shares held	1,250,000
Non-restricted held	138,620
IronNet [Member] | Warrants [Member]
Subsequent Event [Line Items]
Sponsor distribution				2,065,000
IronNet [Member] | Warrants [Member] | Common Stock [Member]
Subsequent Event [Line Items]
Sponsor distribution						2,065,000
IronNet [Member] | Warrants [Member] | Subsequent Events [Member] | Common Stock [Member]
Subsequent Event [Line Items]
Cashless exercise of warrants		(2,065,000)

X

- Definition

Cashless exercise of warrants.

+ References

No definition available.

+ Details

Name:	lgl_CashlessExerciseOfWarrants
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

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

Shares maintained in portfolio.

+ References

No definition available.

+ Details

Name:	lgl_SharesMaintainedInPortfolio
Namespace Prefix:	lgl_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of investment in marketable security, classified as current.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section 45
-Paragraph 1
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=124098289&loc=d3e6676-107765

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.2)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_MarketableSecuritiesCurrent
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_RelatedPartyTransactionsByRelatedPartyAxis=lgl_IronNetMember
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_InvestmentTypeAxis=us-gaap_WarrantMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: