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Condensed Consolidated Statements of Operations (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Condensed Consolidated Statements of Operations        
Net sales $ 93,341 $ 99,324 $ 279,304 $ 258,540
Cost of sales 60,783 69,016 182,296 171,040
Gross profit 32,558 30,308 97,008 87,500
Operating expenses:        
Selling, general and administrative 21,712 19,650 65,270 59,077
Research and development 19,968 18,993 60,747 60,600
Amortization 3,149 855 8,951 2,566
Restructuring 2,317 1,240 3,510 1,771
Asset impairment 2,864   2,864  
Total operating expenses 50,010 40,738 141,342 124,014
Other operating, net 36 (493) (334) (141)
Changes in contingent consideration     (29,368)  
Operating income (loss) (17,488) (9,937) (14,632) (36,373)
Interest income (expense), net 305 192 541 620
Income (loss) before income taxes (17,183) (9,745) (14,091) (35,753)
Income tax provision (benefit) (3,206) (3,719) (4,063) (15,575)
Net income (loss) $ (13,977) $ (6,026) $ (10,028) $ (20,178)
Basic:        
Income (loss) (in dollars per share) $ (0.35) $ (0.16) $ (0.26) $ (0.52)
Diluted :        
Income (loss) (in dollars per share) $ (0.35) $ (0.16) $ (0.26) $ (0.52)
Weighted average shares outstanding:        
Basic (in shares) 39,401 38,841 39,317 38,774
Diluted (in shares) 39,401 38,841 39,317 38,774