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Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Consolidated Statements of Operations        
Net sales $ 115,066 $ 75,348 $ 209,452 $ 153,359
Cost of sales 76,346 43,909 136,533 89,964
Gross profit 38,720 31,439 72,919 63,395
Operating expenses, net:        
Research and development 18,619 21,543 33,608 43,653
Selling, general, and administrative 22,698 19,995 41,801 39,834
Amortization of intangible assets 6,354 5,273 9,221 10,524
Restructuring 3,257 2,095 4,595 2,195
Acquisition costs 14,133   15,494  
Asset impairment 675 13,627 1,138 13,627
Other, net (10) 159 (87) 88
Total operating expenses, net 65,726 62,692 105,770 109,921
Operating income (loss) (27,006) (31,253) (32,851) (46,526)
Interest income 782 290 1,575 596
Interest expense (5,061) (105) (9,196) (143)
Income (loss) before income taxes (31,285) (31,068) (40,472) (46,073)
Income tax expense (benefit) (12,897) 1,014 (23,179) 1,542
Net income (loss) $ (18,388) $ (32,082) $ (17,293) $ (47,615)
Income (loss) per common share:        
Basic (in dollars per share) $ (0.43) $ (0.82) $ (0.42) $ (1.22)
Diluted (in dollars per share) $ (0.43) $ (0.82) $ (0.42) $ (1.22)
Weighted average number of shares:        
Basic (in shares) 42,656 38,965 41,160 39,035
Diluted (in shares) 42,656 38,965 41,160 39,035