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Estimated Fair Value of Financial Instruments - Warrant Liability (Details) - USD ($)
12 Months Ended
Feb. 10, 2017
Oct. 11, 2016
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Changes in the estimated fair value for warrant liability          
Changes in fair value of warrant liabilities     $ 108,635,809 $ 61,073,808 $ 0
Warrant          
Number of Warrants          
Warrants outstanding at beginning of year     18,655,804    
Additions     (18,205,804)    
Warrants outstanding at end of period     450,000 18,655,804  
Warrant | Level 2          
Fair value assumptions for warrants          
Risk-free interest rate 1.47% 0.87%      
Expected remaining term 3 years 2 years      
Expected volatility 71.42% 75.00%      
Dividend yield 0.00% 0.00%      
Changes in the estimated fair value for warrant liability          
Fair value at beginning of year     $ 90,706,000    
Additions, pursuant to public offering     (190,369,000)    
Changes in fair value of warrant liabilities     108,636,000    
Fair value at end of year     $ 8,973,000 $ 90,706,000  
Warrant | October 11, 2016 public offering | Level 2          
Fair value assumptions for warrants          
Risk-free interest rate     1.95% 1.38%  
Expected remaining term     3 months 11 days 1 year 3 months 10 days  
Expected volatility     60.00% 73.85%  
Dividend yield     0.00% 0.00%  
Warrant | February 10, 2017 stock purchase agreement | Level 2          
Fair value assumptions for warrants          
Risk-free interest rate       1.14%  
Expected remaining term       6 months 4 days  
Expected volatility       69.34%  
Dividend yield       0.00%