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Consolidated Statements of Operations (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Consolidated Statements of Operations        
Net sales $ 95,122 $ 97,435 $ 185,963 $ 159,216
Cost of sales 64,449 62,795 121,513 102,024
Gross profit 30,673 34,640 64,450 57,192
Operating expenses:        
Selling, general and administrative 21,891 19,779 43,558 39,427
Research and development 21,011 20,870 40,779 41,607
Amortization 2,899 855 5,802 1,711
Restructuring 801   1,193 531
Total operating expenses 46,602 41,504 91,332 83,276
Other operating, net (158) (52) (370) 352
Changes in contingent consideration     (29,368)  
Operating income (loss) (15,771) (6,812) 2,856 (26,436)
Interest income (expense), net 72 236 236 428
Income (loss) before income taxes (15,699) (6,576) 3,092 (26,008)
Income tax provision (benefit) (488) (2,495) (857) (11,856)
Net income (loss) $ (15,211) $ (4,081) $ 3,949 $ (14,152)
Basic:        
Income (loss) (in dollars per share) $ (0.39) $ (0.11) $ 0.10 $ (0.37)
Diluted :        
Income (loss) (in dollars per share) $ (0.39) $ (0.11) $ 0.10 $ (0.37)
Weighted average shares outstanding:        
Basic (in shares) 39,379 38,764 39,275 38,740
Diluted (in shares) 39,379 38,764 40,061 38,740