Annual report pursuant to Section 13 and 15(d)

Shareholders' Equity and Capital Stock - warrants activity (Details)

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Shareholders' Equity and Capital Stock - warrants activity (Details) - $ / shares
 12 Months Ended
Sep. 25, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Sep. 30, 2018
Dec. 31, 2016
Class of Warrant or Right            
Outstanding Beginning Balance, Warrants   13,062,878 5,844,567 5,844,567    
Granted, Warrants     13,062,878 0    
Expired, Warrants     (5,844,567)      
Outstanding Ending Balance, Warrants 13,062,878 13,062,878 13,062,878 5,844,567    
Outstanding Beginning Balance, Number of shares to be issued upon exercise   6,531,439 5,844,567 5,844,567    
Granted, Number of shares to be issued upon exercise     6,531,439 0    
Expired, Number of shares to be issued upon exercise     (5,844,567)      
Ending Balance, Number of shares to be issued upon exercise   6,531,439 6,531,439 5,844,567    
Per share exercise price, Outstanding   $ 1.00 $ 1.00 $ 0.97   $ 1.02
Granted, Weighted-average exercise price     1.00      
Expired, Weighted-average exercise price     $ 0.97      
Warrants            
Class of Warrant or Right            
Number of common shares for warrants to purchase 6,097,561          
Stock Repurchased During Period, Shares 6,531,439          
Stock Repurchased, Price Per Share $ 1.00          
Per share exercise price, Outstanding         $ 1.00