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Organization and description of business operations - November 2021 Offering (Details) - USD ($)
$ / shares in Units, $ in Thousands
6 Months Ended 12 Months Ended
Nov. 09, 2021
Nov. 05, 2021
Nov. 02, 2021
Jun. 30, 2022
Dec. 31, 2021
Class of Warrant or Right [Line Items]          
Common shares outstanding       63,753,834 63,619,140
November 2021          
Class of Warrant or Right [Line Items]          
Number of warrants exercised       0 0
Underwriting Agreement          
Class of Warrant or Right [Line Items]          
Share issue price     $ 0.64    
Initial exercise price $ 0.31        
Issuance of common stock and warrants, net of issuance costs (in shares)     21,325,000    
Common shares outstanding 26,953,125        
Proceeds from the issuance of common stock and warrants, gross $ 17,250        
Proceeds from the issuance of common stock and warrants, net of issuance costs $ 15,800        
Underwriting Agreement | Maximum          
Class of Warrant or Right [Line Items]          
Warrants to purchase shares 26,953,125        
Underwriting Agreement | November 2021          
Class of Warrant or Right [Line Items]          
Warrant exercise price   $ 0.70      
Number of warrants exercised       0 0
Term of warrants   5 years      
Underwriting Agreement | Prefunded warrants          
Class of Warrant or Right [Line Items]          
Initial exercise price     $ 0.639    
Warrants to purchase shares     1    
Shares per warrant     1    
Warrant exercise price   $ 0.001