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STOCKHOLDERS’ EQUITY / DEFICIT - 2015 Equity Incentive Plan (Details) - shares
May 18, 2016
Dec. 31, 2018
Dec. 31, 2017
May 17, 2017
Jun. 08, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Common stock, shares authorized (in shares)   100,000,000 100,000,000    
2015 Equity Incentive Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Common stock, shares authorized (in shares)         1,400,000
Shares remaining available for issuance under the plan (in shares)         600,000
2015 Equity Incentive Plan Amended          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Common stock, shares authorized (in shares) 1,600,000     1,800,000  
Shares remaining available for issuance under the plan (in shares) 700,000        
Options | 2015 Equity Incentive Plan Amended          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation arrangement by share-based payment award, reduction in number of shares available for grant 100.00%        
Restricted Stock | 2015 Equity Incentive Plan Amended          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation arrangement by share-based payment award, reduction in number of shares available for grant 200.00%