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Subsequent Event - Narrative (Details) - USD ($)
1 Months Ended
Oct. 31, 2018
Sep. 30, 2018
Dec. 31, 2017
Subsequent Event [Line Items]      
Term loans payable   $ 50,446,000 $ 49,315,000
Subsequent event      
Subsequent Event [Line Items]      
Number of warrants (in shares) 341,578    
Exercise price per share (in dollars per share) $ 21.12    
Number of additional warrants to be issued on future draw, percentage of diluted shares outstanding (as a percentage) 0.30%    
Percentage premium to average closing trading price (as a percentage) 25.00%    
CRG Servicing LLC Amended and Restated Loan Agreement | Subsequent event      
Subsequent Event [Line Items]      
Credit facility, maximum borrowing capacity $ 100,000,000    
Proceeds from debt net of debt extinguishment and costs 7,800,000    
Proceeds from borrowings 60,000,000    
Term loans payable 50,400,000    
Additional borrowing capacity $ 40,000,000    
Percentage of accrue interest 10.50%    
Percentage of deferred payment 3.00%    
Interest deferral period 6 years    
Upfront fee of aggregate principal amount (as a percentage) 0.50%    
Percentage payment up on repayment of principal amount 2.00%    
June 30, 2019 | CRG Servicing LLC Amended and Restated Loan Agreement | Subsequent event      
Subsequent Event [Line Items]      
Credit facility, additional borrowing capacity $ 20,000,000    
After December 31, 2019 | Subsequent event      
Subsequent Event [Line Items]      
Credit facility, additional borrowing capacity $ 20,000,000