Quarterly report pursuant to Section 13 or 15(d)

STOCK-BASED COMPENSATION (Restricted Stock Activity) (Details)

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STOCK-BASED COMPENSATION (Restricted Stock Activity) (Details) - Restricted stock units
9 Months Ended
Sep. 30, 2018
$ / shares
shares
Number of Restricted Share Units  
Outstanding at beginning of year (in shares) | shares 1,476,858
Granted (in shares) | shares 1,379,905
Vested (in shares) | shares (621,263)
Canceled (in shares) | shares (164,201)
Outstanding at end of year (in shares) | shares 2,071,299
Weighted- Average Grant-Date Fair Value Per Share  
Outstanding at beginning of year (in dollars per share) | $ / shares $ 4.96
Granted (in dollars per share) | $ / shares 4.81
Vested (in dollars per share) | $ / shares 4.93
Canceled (in dollars per share) | $ / shares 5.16
Outstanding at end of year (in dollars per share) | $ / shares $ 4.85