Annual report pursuant to Section 13 and 15(d)

Stockholders' deficit, Warrants (Details)

v3.20.1
Stockholders' deficit, Warrants (Details) - USD ($)
$ / shares in Units, $ in Thousands
 8 Months Ended 12 Months Ended
Dec. 19, 2019
Nov. 04, 2019
Sep. 17, 2019
May 06, 2019
Dec. 31, 2019
Dec. 31, 2018
Number of Warrants [Abstract]            
Warrants acquired (in shares)       712,823    
Issued (in shares)         17,414,030 0
Exercised (in shares) [1]         (1,144,999)  
Warrants outstanding (in shares)         9,533,354 0
Weighted Average Exercise Price [Abstract]            
Warrants acquired (in dollars per share)       $ 3.90    
Issued (in dollars per share)         $ 3.27  
Exercised (in dollars per share)         3.50  
Warrants outstanding (in dollars per share)         $ 3.23  
Warrants conversion rate (in shares)         1.1  
Number of warrants converted (in shares)         1,259,498  
Warrants outstanding, intrinsic value         $ 12,200  
Exercise Price $5.00 [Member]            
Number of Warrants [Abstract]            
Issued (in shares) 937,500 11,000        
Weighted Average Exercise Price [Abstract]            
Warrants, exercisable period         24 months  
Warrants, exercise price (in dollars per share) $ 5.00 $ 5.00        
Exercise price $1.82 [Member]            
Number of Warrants [Abstract]            
Issued (in shares) 6,500,000          
Weighted Average Exercise Price [Abstract]            
Warrants, exercisable period         24 months  
Warrants, exercise price (in dollars per share) $ 1.82          
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    
Warrants, exercisable period         24 months  
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 $0.10 [Member] | Tranche One [Member]            
Weighted Average Exercise Price [Abstract]            
Warrants, exercisable period         12 months  
Warrants exercisable (in shares)     1,250,000      
Advisor [Member] | Exercise Price $0.10 [Member] | Tranche Two [Member]            
Weighted Average Exercise Price [Abstract]            
Warrants, exercisable period         18 months  
Warrants exercisable (in shares)     1,250,000      
Advisor [Member] | Exercise Price $10.00 [Member]            
Number of Warrants [Abstract]            
Issued (in shares)     1,500,000      
Weighted Average Exercise Price [Abstract]            
Exercised (in dollars per share)     $ 10.00      
Warrants, exercisable period         18 months  
Warrants exercisable (in shares)     1,500,000      
[1] Exercised warrants were converted at 1.1 shares per warrant for a total of 1,259,498 shares.