XML 55 R45.htm IDEA: XBRL DOCUMENT v3.22.2.2
Stock-based compensation - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
6 Months Ended
Apr. 14, 2022
Jun. 30, 2022
Jun. 30, 2021
Apr. 30, 2020
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]        
Weighted average grant date fair value, stock options granted (in usd per share)   $ 0 $ 0.62  
Fair value of stock options vested   $ 1,703 $ 535  
Common stock warrants        
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]        
Warrants expired (in shares) 617,972      
Warrants, exercise price (in usd per share) $ 1.75     $ 1.75
Warrants outstanding (in shares)   0