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Stock-Based Compensation - Performance 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
Fair value assumptions:          
Stock based compensation expenses   $ (1,461,014) $ 1,501,326 $ (526,168) $ 3,018,628
Restricted stock units - Performance based awards          
Number of Shares          
Unvested at beginning of period (in shares)       988,958 988,958
Forfeited (in shares)       (905,625)  
Unvested at end of period (in shares)   83,333 988,958 83,333 988,958
Weighted Average Grant Date Fair Value          
Unvested at beginning of period (in dollars per share)       $ 4.48 $ 4.48
Forfeited (in dollars per share)       4.61  
Unvested at end of period (in dollars per share)   $ 3.09 $ 4.48 $ 3.09 $ 4.48
Fair value assumptions:          
Stock based compensation expenses   $ (1,196,713) $ 402,814 $ (1,025,502) $ 801,202
Unrecognized stock-based compensation expense   $ 100,000   $ 100,000  
Unrecognized stock-based compensation expense, weighted average remaining term (in years)       2 years  
President and Chief Executive Officer | Restricted stock units - Performance based awards          
Number of Shares          
Forfeited (in shares) (905,625)        
Fair value assumptions:          
Estimated expense reduction in stock compensation expense related to forfeited stock awards $ 1,300,000