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STOCK AWARD PLAN AND STOCK-BASED COMPENSATION - Additional Information (Details) - USD ($)
1 Months Ended 3 Months Ended
Jan. 01, 2018
Jun. 30, 2018
Dec. 31, 2017
Mar. 31, 2019
Mar. 31, 2018
Stock Award Plan and Stock-Based Compensation          
Fair value of common stock on grant date (in dollars per share)       $ 5.17  
Total intrinsic value of the stock options exercised       $ 200,000 $ 0
Dividend yield (as a percent)       0.00%  
Stock-based compensation expense       $ 2,461,699 $ 2,113,936
Employee Stock Option          
Stock Award Plan and Stock-Based Compensation          
Shares issued       0  
Fair value of common stock on grant date (in dollars per share)         $ 4.47
Total unrecognized compensation costs       $ 21,200,000  
Weighted-average period over which unrecognized compensation costs is expected to be recognized       3 years  
Dividend yield (as a percent)         0.00%
RSUs          
Stock Award Plan and Stock-Based Compensation          
Total unrecognized compensation costs       $ 1,300,000  
Weighted-average period over which unrecognized compensation costs is expected to be recognized       1 year 9 months 18 days  
Vesting rights percentage       25.00%  
Vesting period       4 years  
Description of vesting rights       RSUs awarded to employees generally vest one-fourth per year over four years from the anniversary of the date of grant  
Non-Employees Stock Options          
Stock Award Plan and Stock-Based Compensation          
Shares issued       0 40,000
Dividend yield (as a percent)         0.00%
Stock-based compensation expense       $ 200,000 $ 200,000
2013 Equity Incentive Plan          
Stock Award Plan and Stock-Based Compensation          
Increase in number of shares authorized for issuance 750,000        
Shares authorized for issuance under the plan 6,531,333        
Additional shares authorized for issuance under the plan as percentage of total shares outstanding 4.00%        
2013 Equity Incentive Plan | Common Stock          
Stock Award Plan and Stock-Based Compensation          
Increase in number of shares authorized for issuance   2,500,000      
2013 Equity Incentive Plan | Employee Stock Option | Common Stock | Rick Russell          
Stock Award Plan and Stock-Based Compensation          
Shares issued     775,000    
Shares issued, price per share     $ 6.05    
2013 Equity Incentive Plan | RSUs | Common Stock | Rick Russell          
Stock Award Plan and Stock-Based Compensation          
Shares issued     40,000    
Maximum | 2013 Equity Incentive Plan | Employee Stock Option          
Stock Award Plan and Stock-Based Compensation          
Term of share-based award 10 years