Quarterly report pursuant to Section 13 or 15(d)

Capitalization and Equity Structure - Warrants (Details)

v3.19.3
Capitalization and Equity Structure - Warrants (Details) - $ / shares
shares in Thousands
 1 Months Ended 9 Months Ended
Dec. 31, 2015
Sep. 30, 2019
May 31, 2019
Sep. 30, 2017
Class Of Warrant Or Right, Outstanding [Roll Forward]        
Beginning balance (in shares)   3,396    
Issued (in shares)   6,667    
Expired (in shares)   (1,504)    
Ending balance (in shares)   8,559    
2019 Warrants        
Schedule of Capitalization, Equity [Line Items]        
Exercise price (in dollars per share)   $ 2 $ 2  
Term (Years)   5 years    
Class Of Warrant Or Right, Outstanding [Roll Forward]        
Beginning balance (in shares)   0    
Issued (in shares)   6,667    
Expired (in shares)   0    
Ending balance (in shares)   6,667    
Information Agent Warrants        
Schedule of Capitalization, Equity [Line Items]        
Exercise price (in dollars per share)   $ 1.5   $ 1.5
Term (Years)   3 years    
Class Of Warrant Or Right, Outstanding [Roll Forward]        
Beginning balance (in shares)   200    
Issued (in shares)   0    
Expired (in shares)   0    
Ending balance (in shares)   200    
2015 Warrants        
Schedule of Capitalization, Equity [Line Items]        
Exercise price (in dollars per share) $ 3.74 $ 2.75    
Term (Years)   5 years    
Class Of Warrant Or Right, Outstanding [Roll Forward]        
Beginning balance (in shares)   1,604    
Issued (in shares) 2,122 0    
Expired (in shares)   0    
Ending balance (in shares)   1,604    
Placement agent warrants        
Schedule of Capitalization, Equity [Line Items]        
Exercise price (in dollars per share)   $ 7    
Term (Years)   5 years    
Class Of Warrant Or Right, Outstanding [Roll Forward]        
Beginning balance (in shares)   426    
Issued (in shares)   0    
Expired (in shares)   (426)    
Ending balance (in shares)   0    
PPO warrants        
Schedule of Capitalization, Equity [Line Items]        
Exercise price (in dollars per share)   $ 14    
Term (Years)   5 years    
Class Of Warrant Or Right, Outstanding [Roll Forward]        
Beginning balance (in shares)   1,078    
Issued (in shares)   0    
Expired (in shares)   (1,078)    
Ending balance (in shares)   0    
Pre-2014 warrants        
Schedule of Capitalization, Equity [Line Items]        
Exercise price (in dollars per share)   $ 9.66    
Class Of Warrant Or Right, Outstanding [Roll Forward]        
Beginning balance (in shares)   88    
Issued (in shares)   0    
Expired (in shares)   0    
Ending balance (in shares)   88    
Pre-2014 warrants | Minimum        
Schedule of Capitalization, Equity [Line Items]        
Term (Years)   9 years    
Pre-2014 warrants | Maximum        
Schedule of Capitalization, Equity [Line Items]        
Term (Years)   10 years