Quarterly report pursuant to Section 13 or 15(d)

STOCK-BASED COMPENSATION - Additional Information (Details)

v3.20.1
STOCK-BASED COMPENSATION - Additional Information (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 273,750    
Employee Service Share Based Compensation Nonvested Total Compensation In Current Year $ 302,003    
Employee Service Share Based Compensation Nonvested Total Compensation In Year Two 349,122    
Employee Service Share Based Compensation Nonvested Total Compensation In Year Three 216,457    
Employee Service Share Based Compensation Nonvested Total Compensation in Year Four 13,185    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 880,767    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 8.82    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price 1.91    
Stock Option Activity [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price $ 2.58    
Non-vested restricted stock [Member] | Stock Incentive Plan 2015 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value     $ 20.96
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period     46,000
Employee [Member] | Non-vested restricted stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Annual Forfeiture Rate Percentage 2.00% 2.00%