Quarterly report pursuant to Section 13 or 15(d)

STOCK INCENTIVE PLAN (Details 2)

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STOCK INCENTIVE PLAN (Details 2) - USD ($)
$ / shares in Units, $ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Shares    
Ending Balance 2,011,087  
Employee Stock Option [Member]    
Shares    
Beginning Balance 1,428,462  
Granted 642,000  
Exercised (8,750)  
Forfeited or expired (50,625)  
Ending Balance 2,011,087 1,428,462
Exercisable at end of period 1,085,331  
Expected to Vest 879,005  
Weighted Average Exercise Price    
Beginning Balance $ 5.20  
Granted 3.30  
Exercised 2.61  
Forfeited or expired 5.04  
Ending Balance 4.61 $ 5.20
Exercisable at end of period 5.44  
Expected to Vest 4.63  
Weighted Average Grant Date Fair value    
Beginning Balance 2.96  
Granted 1.86  
Exercised 2.18  
Forfeited or expired 3.56  
Ending Balance 2.60 $ 2.96
Exercisable at end of period 3.36  
Expected to Vest $ 2.62  
Weighted Average Remaining Contractual Term    
Contractual term 4 years 6 months 3 years 8 months 12 days
Exercisable at end of period 2 years 8 months 12 days  
Expected to Vest 4 years 6 months  
Aggregate Intrinsic Value    
Beginning Balance $ 653  
Exercised 12  
Forfeited or expired 11  
Ending Balance 2,156 $ 653
Exercisable at end of period 742  
Expected to Vest $ 1,351