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v3.21.1

Revenue - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Revenue from Contract with Customer [Abstract] |  |
Revenue recognized, previously included in customer advances and deferred revenue | $ 1.3 | $ 0.2

X
- Definition Contract With Customer, Liability, Revenue Recognized During Period + References No definition available. + Details
Name: | lasr_ContractWithCustomerLiabilityRevenueRecognizedDuringPeriod
Namespace Prefix: | lasr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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