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Convertible Promissory Notes - Additional Information (Details) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended
Mar. 31, 2018
Nov. 30, 2017
Oct. 31, 2017
Aug. 31, 2017
Apr. 30, 2017
Jan. 31, 2017
Jun. 30, 2016
Sep. 30, 2018
Jun. 30, 2018
Jun. 30, 2018
Debt Instrument [Line Items]                    
Annual interest rate     2.00% 2.00% 2.00% 0.00%        
Debt instrument maturity term           3 years        
Debt Instrument Face Amount           $ 10,000,000        
Debt Instrument Carrying Amount     $ 6,000,000 $ 6,000,000 $ 6,000,000 4,000,000        
Debt Instrument Periodic Payment Principal           6,000,000        
Interest expense                 $ 49,000,000 $ 284,000,000
Loss on extinguishment of related party convertible promissory note                   2,180,000
Embedded derivative, Derivative liability             $ 31,000      
June 2016 Note                    
Debt Instrument [Line Items]                    
Annual interest rate             8.00%      
Debt instrument maturity term             3 years      
Increase of interest rate             12.00%      
Debt Instrument Face Amount             $ 1,500,000      
June 2016 Note | Convertible Promissory Notes                    
Debt Instrument [Line Items]                    
Loss on extinguishment of related party convertible promissory note               $ 199,000    
January 2017 Notes                    
Debt Instrument [Line Items]                    
Repayments of convertible debt $ 4,000,000                  
January 2017 Notes | Convertible Promissory Notes                    
Debt Instrument [Line Items]                    
Debt Instrument Carrying Amount     $ 4,000,000   2,000,000 $ 4,000,000        
Repayments of convertible debt $ 4,000,000 $ 4,000,000     $ 2,000,000          
Derivative liabilities written off with conversion of repayment                   300,000
Loss on extinguishment of related party convertible promissory note                   $ 2,200,000