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COMMON STOCK AND STOCK INCENTIVE PLANS - Significant Ranges of Outstanding and Exercisable Stock Options (Details)
 12 Months Ended
Dec. 31, 2017
$ / shares
shares
Options exercisable and vested and expected to vest at the end of the period  
Number of options exercisable (in shares) | shares 44,371
Weighted-average exercise price per share of options exercisable (in dollars per share) $ 2.36
Number of options vested and expected to vest (in shares) | shares 244,321
Weighted-average exercise price per share of options vested and expected to vest (in dollars per share) $ 2.26
Exercise Price Range from Dollars 2.24 to 2.24  
Exercise Price Range  
Exercise price, low end of range (in dollars per share) 2.24
Exercise price, high end of range (in dollars per share) $ 2.24
Stock Options Outstanding  
Number of shares outstanding (in shares) | shares 241,600
Weighted-average remaining contractual life 5 years 29 days
Weighted-average exercise price per share (in dollars per share) $ 2.24
Stock Options Exercisable  
Number of shares Exercisable (in shares) | shares 41,650
Weighted-average exercise price per share (in dollars per share) $ 2.24
Exercise Price Range from Dollars 4.17 to 4.17  
Exercise Price Range  
Exercise price, low end of range (in dollars per share) 4.17
Exercise price, high end of range (in dollars per share) $ 4.17
Stock Options Outstanding  
Number of shares outstanding (in shares) | shares 2,721
Weighted-average remaining contractual life 8 months 1 day
Weighted-average exercise price per share (in dollars per share) $ 4.17
Stock Options Exercisable  
Number of shares Exercisable (in shares) | shares 2,721
Weighted-average exercise price per share (in dollars per share) $ 4.17
Exercise Price Range From Dollars 2.24 To 4.17  
Exercise Price Range  
Exercise price, low end of range (in dollars per share) 2.24
Exercise price, high end of range (in dollars per share) $ 4.17
Stock Options Outstanding  
Number of shares outstanding (in shares) | shares 244,321
Weighted-average remaining contractual life 5 years 11 days
Weighted-average exercise price per share (in dollars per share) $ 2.26
Stock Options Exercisable  
Number of shares Exercisable (in shares) | shares 44,371
Weighted-average exercise price per share (in dollars per share) $ 2.36