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Shareholders' equity, net - Profit (loss) per share (Details) - USD ($)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of Shareholders' equity, net [Line Items]      
Profit (loss) net (numerator) $ (12,208,000) $ (13,445,000) $ 60,823,000
Profit (loss) net (numerator) $ (17,945,000) $ 154,000 $ 74,779,000
Total common and investment shares (denominator) 253,986,867 253,986,867 253,986,867
Profit (loss) net per basic share and diluted $ (0.05) $ (0.05) $ 0.24
Profit (loss) net per basic share and diluted $ (0.01) $ (0.02) $ 0.28
Continuing operations [member]      
Disclosure of Shareholders' equity, net [Line Items]      
Profit (loss) net (numerator) $ (1,694,000,000) $ (1,637,000,000) $ 71,167,000,000
Total common and investment shares (denominator) 253,986,867 253,986,867 253,986,867
Profit (loss) net per basic share and diluted $ (0.01) $ (0.02) $ 0.28