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Condensed Consolidated Statements of Operations (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Cost of revenue        
Stock-based compensation $ 42 $ 41 $ 95 $ 130
Additional amortization of non-cancelable prepaid royalty 0 35 0 91
Research and development        
Stock-based compensation 429 413 918 1,239
Selling, general and administrative        
Stock-based compensation $ 422 $ 487 $ 958 $ 1,275