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Stockholders' equity (deficit) - Summary of Stock Option Activity (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2023
Dec. 31, 2022
Equity [Abstract]    
Options awards outstanding, Beginning balance 172  
Options awards outstanding, Expired (69)  
Options awards outstanding, Ending balance 103 172
Options awards outstanding, weighted average exercise price, Beginning balance $ 228.28  
Options awards outstanding, weighted average exercise price, Expired 219.07  
Options awards outstanding, weighted average exercise price, Ending balance $ 234.32 $ 228.28
Options awards outstanding, aggregate intrinsic value $ 0  
Options awards outstanding, Weighted Average Remaining Contractual Life (in Years) 2 years 8 months 12 days 3 years 7 months 6 days
Options awards exercisable, Beginning balance 170  
Options awards exercisable, Expired (69)  
Options awards exercisable, Ending balance 101 170
Options awards exercisable, weighted average exercise price, Beginning balance $ 229.43  
Options awards exercisable, weighted average exercise price, Expired 219.07  
Options awards exercisable, weighted average exercise price, Ending balance $ 236.66 $ 229.43
Options awards exercisable, Aggregate Intrinsic Value $ 0  
Options awards exercisable, Weighted Average Remaining Contractual Life (in Years) 2 years 8 months 12 days 3 years 7 months 6 days