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Share-based Compensation - Tables (Details) - shares
6 Months Ended 12 Months Ended
Jun. 30, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]    
Outstanding — beginning balance 6,356,203 6,084,836
Granted 1,150,000 1,051,550
Exercised 0 (78,384)
Canceled (2,060,651) (701,799)
Outstanding — ending balance 5,445,552 6,356,203
Exercisable — June 30, 2017 3,285,389  
Restricted Stock Units (RSUs)    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]    
Non-vested — beginning balance 2,975,800 960,203
Granted 1,480,301 2,914,000
Vested (990,150) (461,866)
Forfeited (1,623,548) (436,537)
Non-vested — ending balance 1,842,403 2,975,800