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CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Amortization of upfront incentive consideration $ 17,139 $ 9,525 $ 43,372 $ 31,575
Stock-based compensation expense 12,913 7,204 36,012 23,328
Cost of revenue [Member]        
Stock-based compensation expense 5,113 2,853 14,259 9,288
Selling, general and administrative [Member]        
Stock-based compensation expense $ 7,800 $ 4,351 $ 21,753 $ 14,040