Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Consolidated Statements of Operations
Net sales	$ 126,757	$ 129,308	$ 443,110	$ 336,025
Cost of sales	80,372	78,779	284,651	215,150
Gross profit	46,385	50,529	158,459	120,875
Operating expenses, net:
Research and development	23,544	24,061	72,793	57,669
Selling, general, and administrative	20,186	29,771	70,842	71,574
Amortization of intangible assets	4,183	12,500	28,102	21,722
Restructuring	2,057	5,010	7,669	9,605
Acquisition costs	249	783	2,906	16,277
Asset impairment		2	252,343	1,139
Other, net	39	(140)	325	(228)
Total operating expenses, net	50,258	71,987	434,980	177,758
Operating income (loss)	(3,873)	(21,458)	(276,521)	(56,883)
Interest income	823	357	2,266	1,932
Interest expense	(5,602)	(5,105)	(16,113)	(14,301)
Income (loss) before income taxes	(8,652)	(26,206)	(290,368)	(69,252)
Income tax expense (benefit)	301	(2,466)	(27,954)	(26,334)
Net income (loss)	$ (8,953)	$ (23,740)	$ (262,414)	$ (42,918)
Income (loss) per common share:
Basic (in dollars per share)	$ (0.19)	$ (0.51)	$ (5.55)	$ (1.00)
Diluted (in dollars per share)	$ (0.19)	$ (0.51)	$ (5.55)	$ (1.00)
Weighted average number of shares:
Basic (in shares)	46,982	46,941	47,283	43,100
Diluted (in shares)	46,982	46,941	47,283	43,100