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
3 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Number of Options    
Options outstanding, beginning 3,516,136  
Forfeited 211,517  
Options outstanding, ending 3,304,619 3,516,136
Options Exercisable 2,756,717  
Options expected to vest 547,903  
Weighted Average Exercise Price    
Weighted average exercise price, beginning balance $ 4.46  
Forfeited 3.13  
Weighted average exercise price, ending balance 4.44 $ 4.46
Options Exercisable 4.61  
Options expected to vest $ 3.73  
Weighted Average Remaining Life    
Weighted Average Remaining Life 6 years 6 months 18 days 6 years 9 months 18 days
Weighted Average Remaining Life, Options Exercisable 5 years 11 months 19 days  
Weighted Average Remaining Life, Options expected to vest 8 years 8 months 19 days