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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)

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