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Cover - shares
 3 Months Ended
Mar. 31, 2021
May 03, 2021
Cover [Abstract]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Mar. 31, 2021  
Document Transition Report false  
Entity File Number 001-38462  
Entity Registrant Name NLIGHT, INC.  
Entity Incorporation, Date of Incorporation DE  
Entity Tax Identification Number 91-2066376  
Entity Address, Address Line One 5408 NE 88th Street, Building E  
Entity Address, City or Town Vancouver  
Entity Address, State or Province WA  
Entity Address, Postal Zip Code 98665  
City Area Code 360  
Local Phone Number 566-4460  
Title of 12(b) Security Common Stock, par value $0.0001 per share  
Trading Symbol LASR  
Security Exchange Name NASDAQ  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Large Accelerated Filer  
Smaller Reporting Company false  
Emerging Growth false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   42,807,788
Entity Central Index Key 0001124796  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2021  
Document Fiscal Period Focus Q1  
Amendment Flag false