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Segment Information - Operating Results (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Segment Reporting Information [Line Items]    
Revenue $ 61,345 $ 43,215
Gross profit $ 17,645 $ 9,501
Gross margin 28.80% 22.00%
Operating Segments | Laser Products    
Segment Reporting Information [Line Items]    
Revenue $ 47,335 $ 36,930
Gross profit $ 17,431 $ 9,375
Gross margin 36.80% 25.40%
Operating Segments | Advanced Development    
Segment Reporting Information [Line Items]    
Revenue $ 14,010 $ 6,285
Gross profit $ 705 $ 471
Gross margin 5.00% 7.50%
Corporate and Other    
Segment Reporting Information [Line Items]    
Revenue $ 0 $ 0
Gross profit $ (491) $ (345)