Quarterly report pursuant to Section 13 or 15(d)

STOCKHOLDERS' EQUITY - Changes in Stock Options (Details)

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STOCKHOLDERS' EQUITY - Changes in Stock Options (Details) - Options - $ / shares
6 Months Ended 12 Months Ended
Jun. 30, 2017
Dec. 31, 2016
Number of Options    
Options outstanding, beginning 3,526,136  
Forfeited 790,732  
Options outstanding, ending 2,725,404 3,526,136
Options Exercisable 2,326,238  
Options expected to vest 399,166  
Weighted Average Exercise Price    
Weighted average exercise price, beginning balance $ 4.46  
Forfeited 4.18  
Weighted average exercise price, ending balance 4.26 $ 4.46
Options Exercisable 4.39  
Options expected to vest $ 3.88  
Weighted Average Remaining Life    
Weighted Average Remaining Life 6 years 2 months 9 days 6 years 9 months 18 days
Weighted Average Remaining Life, Options Exercisable 5 years 9 months 7 days  
Weighted Average Remaining Life, Options expected to vest 8 years 7 months 28 days