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Stock - Based Compensation (Tables)
6 Months Ended
Jun. 30, 2019
Share-based Payment Arrangement [Abstract]  
Schedule of restricted stock unit activity
  Number of
Shares
 
     
Unvested Outstanding at September 30, 2018   2,272,261 
Granted   721,522 
Forfeited   (13,202)
Vested   (39,053)
Unvested Outstanding at June 30, 2019   2,941,528