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Term Loan (Details)
1 Months Ended
Jun. 22, 2016
USD ($)
Jun. 17, 2016
USD ($)
loan
Mar. 31, 2018
Jun. 30, 2018
USD ($)
Debt Financing Agreement        
Debt Instrument [Line Items]        
Maximum borrowing capacity   $ 30,000,000.0    
Number of term loans | loan   2    
Period for principal and interest payments   24 months    
Stated interest rate, percentage   8.51%    
Unrestricted cash raised target       $ 30,000,000
Amended period for principal and interest payments     15 months  
Prepayment fee, option one       2.00%
Prepayment fee, option two       1.00%
Debt extinguishment fee       5.50%
Term loan, less debt issuance costs       $ 20,000,000
Amounts borrowed       20,000,000
Deferred finance cost       $ 100,000
Debt instrument effective rate       8.98%
Debt Financing Agreement | London Interbank Offered Rate (LIBOR)        
Debt Instrument [Line Items]        
Basis spread on variable rate, percentage   0.44%    
Debt Financing Agreement Tranche A        
Debt Instrument [Line Items]        
Maximum borrowing capacity   $ 20,000,000.0    
Proceeds from borrowing under term loan $ 20,000,000      
Term loan, less debt issuance costs       $ 20,000,000
Debt Financing Agreement Tranche B        
Debt Instrument [Line Items]        
Maximum borrowing capacity   $ 10,000,000.0