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Condensed Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Income Statement [Abstract]        
Net revenues $ 54,577 $ 44,330 $ 162,886 $ 129,884
Cost of net revenues 40,109 33,844 120,461 105,343
Gross profit 14,468 10,486 42,425 24,541
Operating costs and expenses:        
Research and development 7,687 7,006 28,135 24,164
Sales and marketing 3,948 2,790 12,403 9,816
General and administrative 9,110 3,381 23,462 12,881
Amortization of purchased intangible assets 273 141 1,096 421
Restructuring charges 953 1,064 789 7,480
Total operating costs and expenses 21,971 14,382 65,885 54,762
Operating loss (7,503) (3,896) (23,460) (30,221)
Other income (expense):        
Change in fair value of warrant liability 0 (4,788) 0 (4,788)
Non-cash change in acquisition-related escrow (10,533) 0 (10,317) 0
Interest expense, net (2,407) (63) (3,319) (28)
Other expense, net (359) (61) (658) (118)
Loss before income taxes (20,802) (8,808) (37,754) (35,155)
Income tax provision 45 24 139 73
Net loss $ (20,847) $ (8,832) $ (37,893) $ (35,228)
Per share data:        
Basic and diluted ($ per share) $ (0.38) $ (0.23) $ (0.73) $ (0.99)
Weighted average shares used in computation of basic and diluted net loss per share:        
Basic and diluted (in shares) 55,181 38,167 51,648 35,568