Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Consolidated Statements of Operations
Net sales	$ 157,779	$ 112,218	$ 316,353	$ 206,717
Cost of sales	102,384	76,371	204,278	136,371
Gross profit	55,395	35,847	112,075	70,346
Operating expenses, net:
Research and development	24,930	18,619	49,250	33,608
Selling, general, and administrative	24,274	22,698	50,657	41,801
Amortization of intangible assets	10,386	6,354	23,918	9,221
Restructuring	2,917	3,257	5,612	4,595
Acquisition costs	1,316	14,133	2,657	15,494
Asset impairment	252,343	675	252,343	1,138
Other, net	443	(10)	286	(87)
Total operating expenses, net	316,609	65,726	384,723	105,770
Operating income (loss)	(261,214)	(29,879)	(272,648)	(35,424)
Interest income	819	782	1,443	1,575
Interest expense	(5,264)	(5,061)	(10,511)	(9,196)
Income (loss) before income taxes	(265,659)	(34,158)	(281,716)	(43,045)
Income tax expense (benefit)	(28,025)	(13,341)	(28,255)	(23,868)
Net income (loss)	$ (237,634)	$ (20,817)	$ (253,461)	$ (19,177)
Income (loss) per common share:
Basic (in dollars per share)	$ (5.02)	$ (0.49)	$ (5.35)	$ (0.47)
Diluted (in dollars per share)	$ (5.02)	$ (0.49)	$ (5.35)	$ (0.47)
Weighted average number of shares:
Basic (in shares)	47,311	42,656	47,332	41,160
Diluted (in shares)	47,311	42,656	47,332	41,160