Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Statement [Abstract]
Revenues	$ 176,619	$ 191,359	$ 138,580
Cost of revenues	124,280	124,398	94,306
Gross profit	52,339	66,961	44,274
Operating expenses:
Research and development	28,137	21,054	15,123
Sales, general, and administrative	34,111	28,844	19,353
Total operating expenses	62,248	49,898	34,476
Income (loss) from operations	(9,909)	17,063	9,798
Other income (expense):
Interest income (expense), net	2,609	728	(1,269)
Other income (expense), net	535	(253)	(1,834)
Income (loss) before income taxes	(6,765)	17,538	6,695
Income tax expense	6,119	3,600	4,858
Net income (loss)	(12,884)	13,938	1,837
Less: Income allocated to participating securities	0	(4,415)	(1,837)
Net income (loss) attributable to common stockholders	$ (12,884)	$ 9,523	$ 0
Net income (loss) per share, basic (in dollars per share)	$ (0.35)	$ 0.38	$ 0.00
Net income (loss) per share, diluted (in dollars per share)	$ (0.35)	$ 0.32	$ 0.00
Shares used in per share calculations:
Basic (in shares)	37,119	24,862	2,735
Diluted (in shares)	37,119	29,959	2,735