Annual report pursuant to Section 13 and 15(d)

STOCK-BASED COMPENSATION - Schedule of Restricted Shares and Restricted Stock Units Activity (Details)

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STOCK-BASED COMPENSATION - Schedule of Restricted Shares and Restricted Stock Units Activity (Details) - $ / shares
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Restricted Stock    
Shares    
Outstanding at the beginning of the year (in shares) 240,433 389,963
Granted (in shares) 86,900 109,320
Vested / Released (in shares) (139,313) (166,847)
Forfeited / Canceled (in shares) (72,942) (290,003)
Outstanding at the end of the year (in shares) 287,578 240,433
Vested at end of year (in shares) 3,932,740 3,793,427
Weighted average fair value at grant date    
Outstanding at the beginning of the year (in dollars per share) $ 3.11 $ 2.44
Granted (in dollars per share) 3.29 3.20
Vested / Released (in dollars per share) 3.18 2.45
Forfeited / Canceled (in dollars per share) 3.39 2.89
Outstanding at the end of the year (in dollars per share) 3.32 3.11
Vested at end of year (in dollars per share) $ 2.30 $ 2.27
Restricted Stock Units (RSUs)    
Shares    
Granted (in shares) 172,500 198,000
Weighted average fair value at grant date    
Granted (in dollars per share) $ 3.55 $ 3.50