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Stock-Based Compensation - Service Based Restricted Stock Units (Details) - USD ($)
3 Months Ended 6 Months Ended
Apr. 17, 2020
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Weighted Average Grant Date Fair Value          
Stock based compensation expenses   $ (1,461,014) $ 1,501,326 $ (526,168) $ 3,018,628
Restricted stock units - Service based awards          
Number of Shares          
Unvested at beginning of period (in shares)       463,786 472,959
Granted (in shares)       188,904 199,938
Vested (in shares)       (128,460)  
Forfeited (in shares)       (104,168) (3,650)
Unvested at end of period (in shares)   420,062 669,247 420,062 669,247
Weighted Average Grant Date Fair Value          
Unvested at beginning of period (in dollars per share)       $ 4.26 $ 4.32
Granted (in dollars per share)       2.09 4.45
Vested (in dollars per share)       4.30  
Forfeited (in dollars per share)       4.66 4.81
Unvested at end of period (in dollars per share)   $ 3.27 $ 4.36 $ 3.27 $ 4.36
Stock based compensation expenses   $ (4,127) $ 427,472 $ 233,987 $ 771,823
Unrecognized stock-based compensation expense   $ 600,000   $ 600,000  
Unrecognized stock-based compensation expense, weighted average remaining term (in years)       1 year  
Estimated expense reduction in stock compensation expense related to forfeited stock awards $ 200,000        
Minimum | Restricted stock units - Service based awards          
Weighted Average Grant Date Fair Value          
Vesting period       1 year  
Maximum | Restricted stock units - Service based awards          
Weighted Average Grant Date Fair Value          
Vesting period       3 years  
President and Chief Executive Officer | Restricted stock units - Service based awards          
Number of Shares          
Forfeited (in shares)         (96,541)