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Right-of-use assets and lease liabilities - Operating leases (Details) - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Right-of-use assets for long-term operating leases    
Beginning balance $ 8,747,000 $ 11,819,000
Additions 500,000 3,830,000
Modification of operating lease (3,825,000) (1,107,000)
Amortization (3,685,000) (5,634,000)
Effect of foreign currency exchange differences 217,000 (161,000)
Ending balance 1,954,000 8,747,000
General and administrative expenses for long-term operating lease 3,762,000 6,077,000
Charge recognized in relation to short-term lease 291,000 $ 301,000
Future minimum payments under non-cancellable short-term operating leases in 2020 $ 119,000  
Discount rate related to operating lease (as a percent) 5.40% 5.50%
Weighted average remaining lease term (in years) 1 year 2 years
Cash payments in respect of operating lease $ 3,797,000 $ 5,149,000
Minimum    
Right-of-use assets and lease liabilities    
Operating lease, term of contract 1 year  
Maximum    
Right-of-use assets and lease liabilities    
Operating lease, term of contract 3 years