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Condensed Consolidated Statements of Operations (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Cost of revenue        
Stock-based compensation $ 52 $ 61 $ 147 $ 191
Additional amortization of non-cancelable prepaid royalty (14) 4 (14) 95
Research and development        
Stock-based compensation 524 562 1,442 1,801
Selling, general and administrative        
Stock-based compensation $ 443 $ 634 $ 1,401 $ 1,909