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Net Loss Per Common Share (Tables)
3 Months Ended
Sep. 30, 2020
Earnings Per Share [Abstract]  
Antidilutive securities excluded from the computation of earnings per share
      Three Months Ended
      September 30,
      2020  2019
Warrants to purchase common stock - liability classified        240,755    240,755 
Warrant to purchase common stock - equity classified    (Note 13)    23,799,177    16,218,908 
Employee stock options    (Note 12)    765,937    1,556 
Employee unvested restricted stock    (Note 12)    3,816,858    2,342,604 
Convertible preferred stock    (Note 11)    —      3,151,148 
         28,622,727    21,954,971