Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Consolidated Statements of Operations
Net sales	$ 332,451	$ 477,038	$ 392,873
Cost of sales	199,593	299,797	257,991
Gross profit	132,858	177,241	134,882
Operating expenses, net:
Research and development	81,016	78,543	81,171
Selling, general, and administrative	77,642	90,188	89,760
Amortization of intangible assets	19,219	27,634	13,146
Restructuring	5,640	4,679	4,394
Asset impairment	69,520	126	58,170
Changes in contingent consideration			(29,368)
Other, net	223	(697)	(3,182)
Total operating expenses, net	253,260	200,473	214,091
Operating income (loss)	(120,402)	(23,232)	(79,209)
Interest income	1,180	1,050	1,570
Interest expense	(222)	(464)	(715)
Income (loss) before income taxes	(119,444)	(22,646)	(78,354)
Income tax expense (benefit)	2,766	9,332	(11,414)
Net income (loss)	$ (122,210)	$ (31,978)	$ (66,940)
Income (loss) per common share:
Basic (in dollars per share)	$ (3.11)	$ (0.80)	$ (1.70)
Diluted (in dollars per share)	$ (3.11)	$ (0.80)	$ (1.70)
Weighted average number of shares:
Basic (in shares)	39,340	39,742	39,350
Diluted (in shares)	39,340	39,742	39,350