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Condensed Consolidated Statements of Operations (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Cost of revenue        
Stock-based compensation $ 69 $ 46 $ 122 $ 90
Restructuring 0 27 0 1,750
Research and development        
Stock-based compensation 362 392 676 821
Selling, general and administrative        
Stock-based compensation 519 268 941 161
Acquisition-related costs $ 730 $ 0 $ 894 $ 0