XML 52 R42.htm IDEA: XBRL DOCUMENT 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