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Warrants (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Jul. 15, 2019
Dec. 31, 2018
Warrants [Abstract]            
Warrant exercise price (in dollars per share) $ 0.001   $ 0.001      
Change in fair value of warrant $ 6,800          
Number of shares received upon automatic exercise of warrant (in shares) 2,000,000   2,000,000      
Common stock, par value (in dollars per share) $ 0.001   $ 0.001     $ 0.001
Share price (in dollars per share) $ 15.00   $ 15.00      
Warrant Liability [Roll Forward]            
Balance as of beginning of period       $ 7,673    
Changes in fair value recognized $ 0 $ 4,116 $ 0 5,278    
Exercise of warrants       (12,951)    
Balance as of end of period   0   $ 0    
Additional Paid-in Capital [Member]            
Warrants [Abstract]            
Change in fair value of warrant $ 6,800          
Perceptive Credit Opportunities Fund, LP [Member]            
Warrants [Abstract]            
Number of shares received upon automatic exercise of warrant (in shares) 863,400   863,400      
Common stock, par value (in dollars per share) $ 0.001   $ 0.001      
Cash received for warrant exercise     $ 116      
Perceptive Credit Opportunities Fund, LP [Member] | Line of Credit [Member]            
Warrants [Abstract]            
Interest rate 2.00%   2.00%      
Debt maturity date     Dec. 16, 2020      
Warrant to purchase senior common equity interest ratio to fully diluted common units 4.50%   4.50%      
Purchase price of warrant within first year of the loan $ 3,000   $ 3,000      
Purchase price of warrant after first year 5,000   5,000      
Warrant liability, fair value $ 5,800   $ 5,800      
Senior Secured Notes Due 2025 [Member]            
Warrants [Abstract]            
Interest rate 12.50%   12.50%   12.50%  
Debt maturity date     Jun. 30, 2025      
Warrant exercise price (in dollars per share) $ 4.25   $ 4.25      
Change in fair value of warrant   $ 6,800        
Number of shares received upon automatic exercise of warrant (in shares) 2,000,000   2,000,000