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Unaudited Interim Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares
Sep. 30, 2021
Dec. 31, 2020
Class of Stock [Line Items]    
Common stock, par value (in USD per share) $ 0.001 $ 0.001
Common stock, authorized (in shares) 200,000,000 200,000,000
Common stock, shares issued (in shares) 121,634,602 102,174,594
Common stock, shares outstanding (in shares) 121,634,602 102,174,594
Preferred stock, par value (in USD per share) $ 0.01 $ 0.01
Preferred stock, shares authorized (in shares) 20,000,000 20,000,000
Series C Preferred Stock    
Class of Stock [Line Items]    
Preferred stock, issued (in shares) 2,297,504 2,297,504
Preferred stock, shares outstanding (in shares) 2,297,504 2,297,504
Series D Preferred Stock    
Class of Stock [Line Items]    
Preferred stock, issued (in shares) 3,195,050 3,195,050
Preferred stock, shares outstanding (in shares) 3,195,050 3,195,050