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Loan Facilities - Additional Information (Details) - USD ($)
$ / shares in Units, shares in Millions
Nov. 08, 2018
Mar. 15, 2018
Nov. 30, 2018
Sep. 30, 2018
Mar. 31, 2018
Debt Instrument [Line Items]          
Embedded derivative liability       $ 275,000 $ 900,000
Intercompany Loan          
Debt Instrument [Line Items]          
Debt instrument, stated interest rate percentage       8.00%  
Note payable under term loan       $ 36,800,000  
Secured Debt | New Loan Agreement          
Debt Instrument [Line Items]          
Loan aggregate amount   $ 20,000,000.0      
First-tier pledge percentage   65.00%      
Accrued unpaid interest       1,011,000  
Fair value of long-term debt   $ 16,600,000      
Relative fair value attributable to warrants       3,396,000  
Note payable under term loan       20,000,000.0  
Embedded derivative liability       $ 881,000  
Common Stock | Secured Debt | New Loan Agreement          
Debt Instrument [Line Items]          
Warrants issued to purchase common shares (in shares)   1.8      
Exercise price of warrants (in dollars per share)   $ 4.40      
Common shares trading days   20 days      
Term of warrants (in years)   4 years      
Fair value of warrants   $ 3,400,000      
Relative fair value attributable to warrants   $ 3,400,000      
Subsequent Event | Bridge Credit Agreement          
Debt Instrument [Line Items]          
Extension fee (as a percentage) 3.00%        
First net cash proceeds to be retained $ 15,000,000.0        
Proceeds reinvestment budget $ 12,000,000.0        
Subsequent Event | New Money Loans          
Debt Instrument [Line Items]          
Increase in interest rate in the event of default 2.00%        
Debt instrument, stated interest rate percentage 11.00%        
Repayment pro rate basis (as a percentage) 58.00%        
Subsequent Event | Roll Up Loans          
Debt Instrument [Line Items]          
Commitment fee (as a percentage) 2.00%        
Exit fee (as a percentage) 3.00%        
Subsequent Event | Intercompany Loan          
Debt Instrument [Line Items]          
Debt instrument, stated interest rate percentage 8.50%        
Note payable under term loan $ 3,500,000        
Repayment pro rate basis (as a percentage) 42.00%        
Consent fee $ 200,000        
Consent fee (as a percentage) 0.50%        
Subsequent Event | Secured Debt | New Loan Agreement          
Debt Instrument [Line Items]          
Note payable under term loan $ 21,200,000   $ 21,200,000    
Subsequent Event | Secured Debt | Bridge Credit Agreement          
Debt Instrument [Line Items]          
Loan aggregate amount $ 72,500,000        
First-tier pledge percentage 65.00%        
Subsequent Event | Secured Debt | New Money Loans          
Debt Instrument [Line Items]          
Loan aggregate amount $ 50,000,000.0        
Subsequent Event | Secured Debt | Roll Up Loans          
Debt Instrument [Line Items]          
Loan aggregate amount $ 22,500,000        
Increase in interest rate in the event of default 2.00%        
Debt instrument, stated interest rate percentage 2.00%