XML 70 R86.htm IDEA: XBRL DOCUMENT v3.20.1
Right-of-use assets and lease liabilities - Operating leases (Details) - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Right-of-use assets for long-term operating leases      
Beginning balance $ 8,747,000 $ 11,819,000  
Additions   3,830,000  
Modification of operating lease   (1,107,000)  
Amortization   (5,634,000)  
Effect of foreign currency exchange differences   (161,000)  
Ending balance   8,747,000 $ 11,819,000
General and administrative expenses for long-term operating lease   6,077,000 3,761,000
Charge recognized in relation to short-term lease   $ 301,000 $ 21,000
Future minimum payments under non-cancellable short-term operating leases in 2020 $ 60,000    
Discount rate related to operating lease (as a percent)   5.50%  
Weighted average remaining lease term (in years)   2 years  
Cash payments in respect of operating lease   $ 5,419,000  
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