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Share-based Compensation - Summary of Company's Restricted Stock Activity (Details) - Restricted Stock
9 Months Ended
Sep. 30, 2018
$ / shares
shares
Shares  
Unvested at beginning of period (in shares) | shares 1,588,406
Granted (in shares) | shares 2,073,612
Vested (in shares) | shares (263,189)
Forfeited (in shares) | shares (162,660)
Unvested at end of period (in shares) | shares 3,236,169
Weighted Average Grant Date Fair Value  
Unvested at beginning of period (in usd per share) | $ / shares $ 5.36
Granted (in usd per share) | $ / shares 6.21
Vested (in usd per share) | $ / shares 5.53
Forfeited (in usd per share) | $ / shares 5.70
Unvested at end of period (in usd per share) | $ / shares $ 5.87