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Share Capital (Details Textual)
 3 Months Ended 6 Months Ended
Mar. 14, 2019
USD ($)
$ / shares
shares
Mar. 07, 2017
USD ($)
$ / shares
Jun. 30, 2021
USD ($)
vote
$ / shares
shares
Jun. 30, 2021
USD ($)
vote
$ / shares
shares
Mar. 31, 2021
USD ($)
shares
Dec. 31, 2020
USD ($)
shares
Jun. 30, 2020
USD ($)
shares
Mar. 31, 2020
USD ($)
shares
Dec. 31, 2019
USD ($)
shares
Share Capital [Line Items]                  
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest     $ (407,692,000) $ (407,692,000) $ (405,583,000) $ (408,910,000) $ (184,606,000) $ (183,944,000) $ (190,575,000)
Preferred Stock                  
Share Capital [Line Items]                  
Proceeds from Issuance of Convertible Preferred Stock $ 98,620,000                
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest   $ 90,123,000 152,746,000 $ 152,746,000 $ 152,746,000 $ 152,746,000 $ 152,746,000 $ 152,746,000 $ 152,746,000
Preferred Stock | Series 4 Convertible Preferred Stock                  
Share Capital [Line Items]                  
Proceeds from Issuance of Convertible Preferred Stock   $ 95,000              
Preferred Stock, Conversion Price Per Preference Share | $ / shares $ 7.42 $ 10.00              
Preferred Stock, Accretion Percentage, Preference 8.00%                
Preferred Stock, Accretion Rate, Preference Per Share | $ / shares       $ 9.20          
Preferred Stock, Accretion of Redemption Discount       $ 5,193,000          
Preferred Stock, Liquidation Preference, Value     $ 133,732,000 $ 133,732,000          
Preferred Stock, Convertible Preference Shares, Convertible at Company's Option, Term 2 years 5 years              
Shares outstanding (shares) | shares     145,000,000 145,000,000 145,000,000 145,000,000 145,000,000 145,000,000 145,000,000
Preferred Stock, Conversion Basis, Common Stock Class A Closing Trade Price 125.00%                
Preferred Stock | Series 6 Convertible Preferred Stock                  
Share Capital [Line Items]                  
Stock Issued During Period, Shares, Issued for Services | shares 50,000                
Proceeds from Issuance of Convertible Preferred Stock $ 50,000,000                
Preferred Stock, Liquidation Preference Per Share | $ / shares $ 1,000 $ 1,000              
Preferred Stock, Conversion Price Per Preference Share | $ / shares $ 5.00                
Preferred Stock, Accretion Percentage, Preference 8.00%                
Preferred Stock, Monthly Accretion of Redemption Discount     $ 7.84            
Preferred Stock, Accretion of Redemption Discount       $ 2,329,000          
Preferred Stock, Liquidation Preference, Value     59,980,000 59,980,000          
Preferred Stock, Convertible Preference Shares, Convertible at Company's Option, Term 2 years 5 years              
Preferred Stock, Conversion Basis, Common Stock Class A Closing Trade Price 125.00%                
Common Stock and Other Paid-in Capital                  
Share Capital [Line Items]                  
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest     $ 97,783,000 $ 97,783,000 $ 106,193,000 $ 104,367,000 $ 98,234,000 $ 99,587,000 $ 101,469,000
Common Shares | Common Class A                  
Share Capital [Line Items]                  
Stock Issued During Period, Shares, Issued for Services | shares 14,285,714                
Proceeds from Issuance of Common Stock $ 50,000,000                
Shares outstanding (shares) | shares     77,254,378 77,254,378   73,529,105      
Common stock, voting rights, number of votes per share | vote     1 1          
Common Stock, Par or Stated Value Per Share | $ / shares     $ 0 $ 0          
Common Shares | Common Class B                  
Share Capital [Line Items]                  
Shares outstanding (shares) | shares     3,743 3,743   3,743      
Common stock, voting rights, number of votes per share | vote     20 20          
Preferred Stock, Par or Stated Value Per Share | $ / shares     $ 0 $ 0