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Equity - Summary of Restricted Stock Activity (Details) - RSUs
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2018
USD ($)
$ / shares
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Number of Units, Outstanding, Beginning balance | shares 1,211,487
Number of Units, Vested | shares (999,677)
Number of Units, Forfeited | shares (15,313)
Number of Units, Outstanding, Ending balance | shares 196,497
Number of Units, Expected to Vest | shares 180,576
Weighted Average Fair Value per Unit, Outstanding Beginning Balance | $ / shares $ 2.91
Weighted Average Fair Value per Unit, Vested | $ / shares 2.90
Weighted Average Fair Value per Unit, Forfeited | $ / shares 2.96
Weighted Average Fair Value per Unit, Outstanding Ending Balance | $ / shares 2.95
Weighted Average Fair Value per Unit, Expected to Vest | $ / shares $ 2.95
Aggregate Fair Value, Outstanding, Beginning balance | $ $ 5,136,705
Aggregate Fair Value, Vested | $ 3,200,943
Aggregate Fair Value, Forfeited | $ 47,560
Aggregate Fair Value, Outstanding, Ending balance | $ 642,545
Aggregate Fair Value, Expected to Vest | $ $ 590,483