Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Deficit, Warrants (Details)

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Stockholders' Deficit, Warrants (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 5 Months Ended 9 Months Ended
May 06, 2019
Sep. 30, 2019
Sep. 30, 2019
Sep. 30, 2018
Number of Warrants [Abstract]        
Warrants acquired (in shares)     712,823  
Issued (in shares)     9,965,530 0
Exercised (in shares)     (1,144,999)  
Warrants outstanding (in shares) 712,823 9,533,354 9,533,354 0
Weighted Average Exercise Price [Abstract]        
Warrants acquired (in dollars per share)     $ 3.90  
Issued (in dollars per share)     4.05  
Exercised (in dollars per share)     3.50  
Warrants outstanding (in dollars per share)   $ 4.01 $ 4.01  
Warrants outstanding, intrinsic value   $ 11,800 $ 11,800  
PIPE Transaction [Member]        
Number of Warrants [Abstract]        
Issued (in shares) 5,744,991      
Weighted Average Exercise Price [Abstract]        
Exercised (in dollars per share) $ 4.25      
Broker [Member]        
Number of Warrants [Abstract]        
Issued (in shares) 220,539      
Weighted Average Exercise Price [Abstract]        
Exercised (in dollars per share) $ 3.00      
Advisor [Member] | Exercise Price $0.10 [Member]        
Number of Warrants [Abstract]        
Issued (in shares)   2,500,000    
Weighted Average Exercise Price [Abstract]        
Exercised (in dollars per share)   $ 0.10    
Advisor [Member] | Exercise Price $10.0 [Member]        
Number of Warrants [Abstract]        
Issued (in shares)   1,500,000    
Weighted Average Exercise Price [Abstract]        
Exercised (in dollars per share)   $ 10.00