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Lease obligation (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Sep. 30, 2021
Lease expense $ 1,400 $ 1,800    
Restricted cash included in deposits and other noncurrent assets $ 1,779 $ 1,779    
Weighted average remaining lease term 5 years 9 months 18 days      
Weighted average incremental borrowing rate 7.90%      
Total minimum lease payments        
Current lease liabilities $ 5,748   $ 5,571  
Non-current lease liabilities 37,124   $ 38,608  
75 and 64 Sidney Street        
Leasehold improvements 5,300      
75 Sidney Street        
Lease term       3 years 3 months 18 days
Financial obligations from sublessee       $ 8,500
75 Hayden Avenue        
Leasehold improvements 5,600      
Deposits and other non-current assets        
Restricted cash included in deposits and other noncurrent assets $ 1,800