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Right-of-use assets and lease liabilities - Operating leases (Details) - USD ($)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Right-of-use assets for long-term operating leases      
Beginning balance $ 1,954,000 $ 8,747,000  
Additions 25,000 500,000  
Modification of operating lease (43,000) (3,825,000)  
Amortization (1,934,000) (3,685,000) $ (5,634,000)
Effect of foreign currency exchange differences 25,000 217,000  
Ending balance 27,000 1,954,000 8,747,000
General and administrative expenses for long-term operating lease 1,934,000 3,762,000 6,077,000
Charge recognized in relation to short-term lease 786,000 $ 291,000 $ 301,000
Future minimum payments under non-cancellable short-term operating leases in 2020 $ 1,322,000    
Discount rate related to operating lease (as a percent) 5.40% 5.40% 5.50%
Weighted average remaining lease term (in years) 1 year 1 year 2 years
Cash payments in respect of operating lease $ 2,003,000 $ 3,797,000 $ 5,149,000
Minimum      
Right-of-use assets and lease liabilities      
Operating lease, term of contract 1 year    
Maximum [Member]      
Right-of-use assets and lease liabilities      
Operating lease, term of contract 3 years