CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Income Statement [Abstract]
Revenue	$ 83,742	$ 102,398	$ 209,677	$ 302,970
Cost of goods sold	59,968	77,994	162,689	215,338
Gross profit	23,774	24,404	46,988	87,632
Operating expenses:
Research and development	13,875	15,276	42,383	40,849
Sales and marketing	3,498	3,692	10,725	11,630
General and administrative	7,719	7,758	22,411	23,350
Acquisition and asset sale related costs	28	87	155	219
Restructuring charges (recoveries)	(12)	141	10	141
Total operating expenses	25,108	26,954	75,684	76,189
Income (loss) from operations	(1,334)	(2,550)	(28,696)	11,443
Interest income	94	21	339	141
Interest expense	(207)	(263)	(654)	(942)
Other income (expense), net	43	(3,317)	306	(2,314)
Total interest and other income expense, net	(70)	(3,559)	(9)	(3,115)
Income (loss) before income taxes	(1,404)	(6,109)	(28,705)	8,328
Income tax (provision) benefit	(456)	1,206	(1,279)	(1,199)
Net income (loss)	$ (1,860)	$ (4,903)	$ (29,984)	$ 7,129
Basic net income (loss) per share (in dollars per share)	$ (0.04)	$ (0.10)	$ (0.58)	$ 0.14
Diluted net income (loss) per share (in dollars per share)	$ (0.04)	$ (0.10)	$ (0.58)	$ 0.14
Weighted average shares used to compute basic net income (loss) per share (in shares)	52,427	49,936	51,599	49,212
Weighted average shares used to compute diluted net income (loss) per share (in shares)	52,427	49,936	51,599	51,411