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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Cost of product revenue    
Stock-based compensation $ 3 $ 14
Research and development    
Stock-based compensation 3,192 3,012
Sales, general and administrative    
Stock-based compensation $ 4,319 $ 3,570