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Stock-Based Compensation and Employee Benefit Plans (Restricted Stock Unit Activity) (Details) - RSUs and PRSUs
9 Months Ended
Sep. 30, 2019
$ / shares
shares
Number of RSUs and PRSUs  
Unvested beginning balance (in shares) | shares 3,307,561
RSUs and PRSUs granted (in shares) | shares 2,491,789
RSUs and PRSUs vested (in shares) | shares (729,174)
RSUs and PRSUs forfeited/expired (in shares) | shares (519,932)
Unvested ending balance (in shares) | shares 4,550,244
Expected to vest after September 30, 2019 (in shares) | shares 3,688,130
Weighted-Average Grant Date Fair Value Per Share  
Unvested, beginning balance (in dollars per share) | $ / shares $ 6.00
RSUs and PRSUs granted (in dollars per share) | $ / shares 5.22
RSUs and PRSUs vested (in dollars per share) | $ / shares 6.97
RSUs and PRSUs forfeited/expired (in dollars per share) | $ / shares 5.87
Unvested, ending balance (in dollars per share) | $ / shares 5.43
Expected to vest after September 30, 2019 (in dollars per share) | $ / shares $ 5.46