Annual report pursuant to Section 13 and 15(d)

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

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STOCK-BASED COMPENSATION - Restricted Stock and Restricted Stock Units Activity (Details) - $ / shares
12 Months Ended
Dec. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
RSAs      
Number of Awards      
Outstanding, beginning of period (shares) 48,668 48,668 73,002
Exercised/Released (shares) (24,334)    
Outstanding, end of period (shares) 48,668    
Vested and expected to vest, end of the period (shares)   48,668  
Weighted Average Fair Value      
Outstanding, beginning of period (usd per share) $ 4.02 $ 4.02 $ 4.02
Exercised/Released (usd per share) 4.02    
Outstanding, end of period (usd per share) $ 4.02    
Vested and expected to vest, end of the period (usd per share)   4.02  
Weighted Average Remaining Contractual Life (Years)      
Outstanding, end of period 2 years 3 months 29 days    
Vested and expected to vest, end of the period 2 years 3 months 29 days    
Number of Awards, Unvested      
Unvested Outstanding, beginning of period (shares) 73,002    
Vested, outstanding shares (shares) (24,334)    
Unvested Outstanding, end of period (shares) 48,668    
Weighted Average Grant Date Fair Value, Unvested      
Unvested Outstanding, beginning of period (usd per share) $ 4.02 $ 4.02 $ 4.02
Vested, outstanding shares (usd per share) 4.02    
Unvested Outstanding, end of period (usd per share) $ 4.02    
Weighted Average Remaining Amortization Period (Years)      
Unvested Outstanding, end of period 1 year 3 months 29 days    
RSUs      
Number of Awards      
Outstanding, beginning of period (shares) 183,067 183,067 281,244
Granted (shares) 162,839    
Exercised/Released (shares) (261,016)    
Outstanding, end of period (shares) 183,067    
Vested and expected to vest, end of the period (shares)   160,815  
Weighted Average Fair Value      
Outstanding, beginning of period (usd per share) $ 1.80 $ 1.80 $ 1.35
Granted (usd per share) 1.87    
Exercised/Released (usd per share) 1.36    
Outstanding, end of period (usd per share) $ 1.80    
Vested and expected to vest, end of the period (usd per share)   1.79  
Weighted Average Remaining Contractual Life (Years)      
Outstanding, end of period 2 years 15 days    
Vested and expected to vest, end of the period 2 years 4 days    
Number of Awards, Unvested      
Unvested Outstanding, beginning of period (shares) 206,533    
Granted (shares) 162,839    
Vested, outstanding shares (shares) (186,305)    
Unvested Outstanding, end of period (shares) 183,067    
Weighted Average Grant Date Fair Value, Unvested      
Unvested Outstanding, beginning of period (usd per share) $ 1.80 $ 1.80 $ 1.44
Granted (usd per share) 1.87    
Vested, outstanding shares (usd per share) 1.46    
Unvested Outstanding, end of period (usd per share) $ 1.80    
Weighted Average Remaining Amortization Period (Years)      
Unvested Outstanding, end of period 1 year 4 months 24 days