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EQUITY INCENTIVE PLAN - Schedule of Restricted Stock Award Activity (Details) - Restricted Stock Award Activity [Member]
6 Months Ended
Jun. 30, 2019
$ / shares
shares
Number of Shares  
Unvested equity awards outstanding at beginning of period (in shares) | shares 461,091
Grants (in shares) | shares 284,655
Vestings (in shares) | shares (99,917)
Forfeitures (in shares) | shares (31,113)
Unvested equity outstanding at end of period (in shares) | shares 614,716
Weighted Average Grant Date Fair Value  
Unvested equity awards outstanding at beginning of period (in dollars per share) | $ / shares $ 9.01
Grants (in dollars per share) | $ / shares 6.76
Vestings (in dollars per share) | $ / shares 8.49
Forfeitures (in dollars per share) | $ / shares 8.29
Unvested equity awards outstanding at end of period (in dollars per share) | $ / shares $ 8.09