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Warrants (Details) - Warrant [Member] - $ / shares
 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Number of Warrants    
Number of warrants, outstanding beginning balance 1,882,661 14,342
Warrants issued in connection with the August 2017 private offering 0 296,006
Warrants issued to underwriters in connection with the August 2017 private offering 0 19,749
Warrants issued in connection with the March 2018 public offering 0 1,533,356
Warrants issued in connection with the October 2018 public offering 10,120,000 0
Warrants issued to underwriters in connection with the October 2019 public offering 303,600 0
Warrants issued in connection with the Armistice debt exchange 4,403,409 0
Warrants issued to investor 0 100,000
Warrants expired 0 (42)
Warrants exercised (250,007) (80,750)
Number of warrants outstanding, ending balance 16,459,663 1,882,661
Weighted Average Exercise Price    
Weighted average exercise price, beginning balance $ 25.94 $ 1,005.80
Warrants issued in connection with the August 2017 private offering 0.00 72
Warrants issued to underwriters in connection with the August 2017 private offering 0.00 72
Warrants issued in connection with the March 2018 public offering 0.00 10.8
Warrants issued in connection with the October 2018 public offering, exercise price 1.50 0.00
Warrants issued to underwriters in connection with the October 2019 public offering, exercise price 1.50 0.00
Warrants issued in connection with the Armistice debt exchange, exercise price 1.00 0.00
Warrants issued to investor 0.00 10.8
Warrants expired 0.00 21,744.00
Warrants exercised 1.5 8.2
Weighted average exercise price, ending balance $ 4.16 $ 25.94
Weighted Average Remaining Contractual Life in Years    
Weighted average remaining contractual life in years, outstanding, beginning balance 4 years 7 months 10 days 4 years 2 months 23 days
Weighted average remaining contractual life in years, outstanding, ending balance 4 years 4 months 2 days 4 years 7 months 10 days