Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Consolidated Statements of Operations
Net sales	$ 158,574	$ 94,499
Cost of sales	101,894	59,999
Gross profit	56,680	34,500
Operating expenses, net:
Research and development	24,320	14,989
Selling, general, and administrative	26,383	19,105
Amortization of intangible assets	13,532	2,867
Restructuring	2,695	1,338
Acquisition costs	1,342	1,361
Asset impairment		463
Other, net	(157)	(78)
Total operating expenses, net	68,115	40,045
Operating income (loss)	(11,435)	(5,545)
Interest income	624	793
Interest expense	(5,246)	(4,135)
Income (loss) before income taxes	(16,057)	(8,887)
Income tax expense (benefit)	(230)	(10,527)
Net income (loss)	$ (15,827)	$ 1,640
Income (loss) per common share:
Basic (in dollars per share)	$ (0.34)	$ 0.04
Diluted (in dollars per share)	$ (0.34)	$ 0.04
Weighted average number of shares:
Basic (in shares)	46,963	39,619
Diluted (in shares)	46,963	40,140