CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Income Statement [Abstract]
Revenue	$ 60,926	$ 97,401
Cost of goods sold	47,587	67,675
Gross profit	13,339	29,726
Operating expenses:
Research and development	13,098	11,884
Sales and marketing	3,865	3,659
General and administrative	7,294	6,789
Acquisition and asset sale related costs	163	12
Total operating expenses	24,420	22,344
Income (loss) from operations	(11,081)	7,382
Interest income	105	98
Interest expense	(227)	(378)
Other income, net	1,143	1,198
Total interest and other income, net	1,021	918
Income (loss) before income taxes	(10,060)	8,300
Income tax provision	(632)	(1,993)
Net income (loss)	$ (10,692)	$ 6,307
Basic net income (loss) per share (in dollars per share)	$ (0.21)	$ 0.13
Diluted net income (loss) per share (in dollars per share)	$ (0.21)	$ 0.12
Weighted average shares used to compute basic net income (loss) per share (in shares)	50,717	48,615
Weighted average shares used to compute diluted net income (loss) per share (in shares)	50,717	50,617