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Fair Value Measurements - Loan and Security Agreement (Details) - Solar Capital and Western Alliance Bank Loan Agreement [Member] - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
May 31, 2018
Sep. 30, 2018
Sep. 30, 2018
Jun. 30, 2018
Fair Value Measurements        
Exit Fee $ 1,500,000      
Level 3 [Member]        
Fair Value Measurements        
Potential payment to Solar Capital Ltd. and Western Alliance Bank     $ 1,500,000  
Percentage of increase in risk component   10.00% 10.00%  
Percentage decrease in risk component   10.00% 10.00%  
Fair value fluctuation due to increase in risk component   $ 100,000 $ 100,000  
Fair value fluctuation due to decrease in risk component   100,000 100,000  
Derivative Liability Exit Fee [Member]        
Fair Value Measurements        
Increase in estimated fair value of exit fee   10,000    
Derivative Liability Exit Fee [Member] | Accrued and other liabilities        
Fair Value Measurements        
Estimated fair value of Exit Fee   $ 556,000 $ 556,000 $ 546,000