Annual report pursuant to Section 13 and 15(d)

SHARE-BASED COMPENSATION (Details)

v3.8.0.1
SHARE-BASED COMPENSATION (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 12 Months Ended
May 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Jun. 30, 2017
Mar. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Proceeds from exercise of stock options   $ 73 $ 0    
Intrinsic value of options exercised   106      
Stock compensation expense   $ 500 $ 400    
Stock options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Weighted average value per share of stock option grants (in USD per share)   $ 1.02 $ 0.67    
Stock options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of stock options granted (in shares)   479,990      
Unrecognized compensation costs   $ 700      
Weighted-average period of unrecognized compensation cost expected to be recognized   1 year 2 months 8 days      
Chief Executive Officer | First anniversary | Stock options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting percentage of stock options   25.00%      
Chief Executive Officer | Monthly after first anniversary | Stock options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting percentage of stock options   0.02083%      
Chief Executive Officer | Daniel R. Lee          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of stock options granted (in shares)   943,834      
Chief Financial Officer | First anniversary | Stock options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting percentage of stock options   25.00%      
Chief Financial Officer | Monthly after first anniversary | Stock options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting percentage of stock options   0.02083%      
Chief Financial Officer | Lewis Fanger          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of stock options granted (in shares)   300,000      
Equity Incentive Plan 2015          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares authorized for issuance       2,500,000 1,400,000
Award terms   10 years      
Number of shares available for future issuance (in shares)   1,037,906      
Equity Incentive Plan 2015 | Stock options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Weighted average value per share of stock option grants (in USD per share) $ 2.32        
Number of stock options granted (in shares) 180,000        
Vesting period of remaining shares 3 years        
Equity Incentive Plan 2015 | President | Stock options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Weighted average value per share of stock option grants (in USD per share) $ 2.32        
Number of stock options granted (in shares) 240,000        
Equity Incentive Plan 2015 | Director | Stock options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Weighted average value per share of stock option grants (in USD per share)   $ 2.32      
Number of stock options granted (in shares)   59,990      
Vesting period of remaining shares   1 year      
Issuance of share based compensation (in shares)   25,860