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SHARE-BASED COMPENSATION - Information and Valuation Assumptions (Details)
9 Months Ended
Sep. 30, 2019
$ / shares
shares
Assumptions used to determine the valuation of granted options  
Expected dividend yield (as a percent) 0.00%
Expected term (in years) 6 years
Key employees  
Share-based compensation  
Percentage of options exercisable in installments beginning on the first anniversary of the grant date 33.30%
Maximum term of stock option plan 10 years
2014 Plan | Key employees  
Share-based compensation  
Granted (in shares) | shares 366,330
Minimum  
Assumptions used to determine the valuation of granted options  
Exercise price | $ / shares $ 4.81
Expected volatility (as a percent) 49.12%
Risk-free rate for expected term (as a percent) 1.95%
Maximum  
Assumptions used to determine the valuation of granted options  
Exercise price | $ / shares $ 5.94
Expected volatility (as a percent) 49.47%
Risk-free rate for expected term (as a percent) 2.38%
Make-whole inducement award | Key employees  
Share-based compensation  
Granted (in shares) | shares 87,478
Stock Options  
Share-based compensation  
Granted (in shares) | shares 453,808
Weighted average grant-date fair value of options granted (in dollars per share) | $ / shares $ 2.53