Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Consolidated Statements of Operations
Net sales	$ 94,386	$ 78,011
Cost of sales	60,186	46,055
Gross profit	34,200	31,956
Operating expenses, net:
Research and development	14,989	22,110
Selling, general, and administrative	20,466	19,839
Amortization of intangible assets	2,867	5,251
Restructuring	1,338	100
Asset impairment	463
Other, net	(78)	(71)
Total operating expenses, net	40,045	47,229
Operating income (loss)	(5,845)	(15,273)
Interest income	793	306
Interest expense	(4,135)	(38)
Income (loss) before income taxes	(9,187)	(15,005)
Income tax expense (benefit)	(10,282)	528
Net income (loss)	$ 1,095	$ (15,533)
Income (loss) per common share:
Basic (in dollars per share)	$ 0.03	$ (0.40)
Diluted (in dollars per share)	$ 0.03	$ (0.40)
Weighted average number of shares:
Basic (in shares)	39,619	39,113
Diluted (in shares)	40,140	39,113