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Stock-based Compensation - Summary of Activities for Restricted Stock Awards ("RSAs") and Restricted Stock Units ("RSUs") (Details) - Restricted Stock
9 Months Ended
Sep. 30, 2017
$ / shares
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Shares of restricted stock outstanding, Beginning balance | shares 586,224
Shares of restricted stock outstanding, Granted | shares 884,081
Shares of restricted stock outstanding, Vested | shares (96,711)
Shares of restricted stock outstanding, Forfeited | shares (126,523)
Shares of restricted stock outstanding, Ending balance | shares 1,247,071
Weighted-average exercise price, Beginning balance | $ / shares $ 17.00
Weighted-average exercise price, Granted | $ / shares 26.60
Weighted-average exercise price, Vested | $ / shares 17.00
Weighted-average exercise price, Forfeited | $ / shares 23.27
Weighted-average exercise price, Ending balance | $ / shares $ 23.17