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STOCK-BASED COMPENSATION (Tables)
 9 Months Ended
Sep. 30, 2019
Share-based Payment Arrangement, Noncash Expense [Abstract]  
Schedule of restricted stock activity
The following table summarizes restricted stock unit activity for the nine months ended September 30, 2019:
 
 
Number of
Unvested
Restricted Stock Units
 
Weighted
Average
Grant Date
Fair Value
 
Number of
Unvested
Performance Vesting Restricted Stock Units
 
Weighted
Average
Grant Date
Fair Value
Unvested shares as of January 1, 2019
1,535,811

 
$
11.57

 
$
—

 
$
—

Granted
4,011,073

 
3.74

 
2,009,144

 
2.85

Vested
(674,374
)
 
12.86

 
—

 
—

Forfeited
(289,610
)
 
7.83

 
(112,742
)
 
1.98

Unvested shares as of September 30, 2019
4,582,900

 
$
4.76

 
1,896,402

 
$
2.91