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v3.21.1

Accrued Expenses and Other Current Liabilities - Narrative (Details) $ in Millions | Dec. 31, 2020 USD ($)
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Payables and Accruals [Abstract] |
Liability for FICA withholding under CARES Act provisions | $ 6.5

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- Definition Social Security Tax, Employer, Deferral, CARES Act + References No definition available. + Details
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Namespace Prefix: | lmb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration