Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Consolidated Statements of Operations
Net sales	$ 78,011	$ 98,341
Cost of sales	46,055	63,205
Gross profit	31,956	35,136
Operating expenses, net:
Selling, general, and administrative	19,839	22,882
Research and development	22,110	18,585
Amortization of intangible assets	5,251	7,962
Restructuring	100	2,357
Asset impairment		126
Other, net	(71)	(951)
Total operating expenses, net	47,229	50,961
Operating income (loss)	(15,273)	(15,825)
Interest income	306	287
Interest expense	(38)	(126)
Income (loss) before income taxes	(15,005)	(15,664)
Income tax expense	528	3,446
Net income (loss)	$ (15,533)	$ (19,110)
Income (loss) per common share:
Basic (in dollars per share)	$ (0.40)	$ (0.48)
Diluted (in dollars per share)	$ (0.40)	$ (0.48)
Weighted average number of shares:
Basic (in shares)	39,113	39,639
Diluted (in shares)	39,113	39,639