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Net Loss Per Common Share (Tables)
3 Months Ended
Sep. 30, 2019
Earnings Per Share [Abstract]  
Securities excluded from the calculation of diluted earnings per share

        Three Months Ended
        September 30
        2019   2018
Warrants to purchase common stock - liability classified   (Note 14)                       240,755                      240,755
Warrant to purchase common stock - equity classified  (Note 14)                  16,218,908                   1,641,906
Employee stock options    (Note 13)                           1,556                          1,787
Employee unvested restricted stock     (Note 13)                    2,342,604                        37,890
Convertible preferred stock     (Note 12)                    3,151,148    – 
                      21,954,971                   1,922,338