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Long-term Debt - CRG Narrative (Details) - USD ($)
1 Months Ended
Sep. 30, 2018
Apr. 30, 2017
May 01, 2019
Apr. 30, 2019
Oct. 31, 2015
Debt Instrument [Line Items]          
Proceeds from debt $ 15,000,000        
Term Loan          
Debt Instrument [Line Items]          
Term loan agreement amount $ 25,000,000       $ 30,000,000
Stated interest rate       10.00%  
Interest rate paid-in-kind     2.00%    
Interest rate paid in cash     8.00%    
Term Loan, Tranche A          
Debt Instrument [Line Items]          
Term loan agreement amount         20,000,000
Term Loan, Tranche B          
Debt Instrument [Line Items]          
Term loan agreement amount         $ 10,000,000
Proceeds from debt   $ 5,000,000