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Borrowings - Convertible promissory notes (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
May 24, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
May 23, 2019
May 24, 2017
Disclosure of detailed information about borrowings [line items]            
Conversion price (in usd per share)     $ 2.50      
Loss on change in fair value     $ 0 $ 776    
Number of shares converted (in shares) 800,000          
Convertible promissory notes            
Disclosure of detailed information about borrowings [line items]            
Notional amount           $ 2,000
Conversion price (in usd per share)           $ 2.50
Number of shares converted (in shares) 800,000          
Convertible promissory notes | Fixed interest rate            
Disclosure of detailed information about borrowings [line items]            
Interest rate           10.00%
Borrowings | Convertible promissory notes            
Disclosure of detailed information about borrowings [line items]            
Loss on change in fair value $ 776 $ 472        
Fair value of convertible promissory notes         $ 6,120