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COMMON STOCK AND STOCK INCENTIVE PLANS - Significant Ranges of Outstanding and Exercisable Stock Options (Details)
 12 Months Ended
Dec. 31, 2016
$ / shares
shares
Options exercisable and vested and expected to vest at the end of the period  
Number of options exercisable (in shares) | shares 274,748
Weighted-average exercise price per share of options exercisable (in dollars per share) $ 3.29
Number of options vested and expected to vest (in shares) | shares 604,680
Weighted-average exercise price per share of options vested and expected to vest (in dollars per share) $ 2.78
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 outstanding (in shares) | shares 266,600
Weighted-average remaining contractual life 6 years 29 days
Weighted-average exercise price per share (in dollars per share) $ 2.24
Stock Options Exercisable  
Number Exercisable (in shares) | shares 0
Weighted-average exercise price per share (in dollars per share) $ 0.00
Exercise Price Range from Dollars 2.70 to 2.70  
Exercise Price Range  
Exercise price, low end of range (in dollars per share) 2.70
Exercise price, high end of range (in dollars per share) $ 2.70
Stock Options Outstanding  
Number outstanding (in shares) | shares 26,666
Weighted-average remaining contractual life 7 years 10 months 28 days
Weighted-average exercise price per share (in dollars per share) $ 2.70
Stock Options Exercisable  
Number Exercisable (in shares) | shares 13,334
Weighted-average exercise price per share (in dollars per share) $ 2.70
Exercise Price Range from Dollars 2.87 to 2.87  
Exercise Price Range  
Exercise price, low end of range (in dollars per share) 2.87
Exercise price, high end of range (in dollars per share) $ 2.87
Stock Options Outstanding  
Number outstanding (in shares) | shares 100,000
Weighted-average remaining contractual life 7 years 7 months 21 days
Weighted-average exercise price per share (in dollars per share) $ 2.87
Stock Options Exercisable  
Number Exercisable (in shares) | shares 50,000
Weighted-average exercise price per share (in dollars per share) $ 2.87
Exercise Price Range from Dollars 2.97 to 2.97  
Exercise Price Range  
Exercise price, low end of range (in dollars per share) 2.97
Exercise price, high end of range (in dollars per share) $ 2.97
Stock Options Outstanding  
Number outstanding (in shares) | shares 26,666
Weighted-average remaining contractual life 2 years 9 months 29 days
Weighted-average exercise price per share (in dollars per share) $ 2.97
Stock Options Exercisable  
Number Exercisable (in shares) | shares 26,666
Weighted-average exercise price per share (in dollars per share) $ 2.97
Exercise Price Range from Dollars 3.21 to 3.21  
Exercise Price Range  
Exercise price, low end of range (in dollars per share) 3.21
Exercise price, high end of range (in dollars per share) $ 3.21
Stock Options Outstanding  
Number outstanding (in shares) | shares 166,666
Weighted-average remaining contractual life 11 days
Weighted-average exercise price per share (in dollars per share) $ 3.21
Stock Options Exercisable  
Number Exercisable (in shares) | shares 166,666
Weighted-average exercise price per share (in dollars per share) $ 3.21
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 outstanding (in shares) | shares 2,721
Weighted-average remaining contractual life 1 year 8 months 1 day
Weighted-average exercise price per share (in dollars per share) $ 4.17
Stock Options Exercisable  
Number Exercisable (in shares) | shares 2,721
Weighted-average exercise price per share (in dollars per share) $ 4.17
Exercise Price Range from Dollars 6.51 to 6.51  
Exercise Price Range  
Exercise price, low end of range (in dollars per share) 6.51
Exercise price, high end of range (in dollars per share) $ 6.51
Stock Options Outstanding  
Number outstanding (in shares) | shares 15,361
Weighted-average remaining contractual life 9 months
Weighted-average exercise price per share (in dollars per share) $ 6.51
Stock Options Exercisable  
Number Exercisable (in shares) | shares 15,361
Weighted-average exercise price per share (in dollars per share) $ 6.51
Exercise Price Range from Dollars 2.24 to 6.51  
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) $ 6.51
Stock Options Outstanding  
Number outstanding (in shares) | shares 604,680
Weighted-average remaining contractual life 4 years 5 months 12 days
Weighted-average exercise price per share (in dollars per share) $ 2.780000
Stock Options Exercisable  
Number Exercisable (in shares) | shares 274,748
Weighted-average exercise price per share (in dollars per share) $ 3.290000