Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Income Statement [Abstract]
Revenue	$ 97,401	$ 79,366
Cost of goods sold	67,675	63,629
Gross profit	29,726	15,737
Operating expenses:
Research and development	11,884	14,683
Sales and marketing	3,659	4,603
General and administrative	6,789	7,753
Amortization of purchased intangible assets	0	119
Asset sale related costs	12	329
Restructuring charges	0	179
Total operating expenses	22,344	27,666
Income (loss) from operations	7,382	(11,929)
Interest income	98	99
Interest expense	(378)	(493)
Other income (expense), net	1,198	(1,598)
Total interest and other income (expense), net	918	(1,992)
Income (loss) before income taxes	8,300	(13,921)
Income tax provision	(1,993)	(170)
Net income (loss)	$ 6,307	$ (14,091)
Basic net income (loss) per share (in dollars per share)	$ 0.13	$ (0.30)
Diluted net income (loss) per share (in dollars per share)	$ 0.12	$ (0.30)
Weighted average shares used to compute basic net income (loss) per share (in shares)	48,615	46,414
Weighted average shares used to compute diluted net income (loss) per share (in shares)	50,617	46,414