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Stock-based compensation - Narrative (FY) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Apr. 14, 2022
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Aug. 05, 2022
Nov. 30, 2020
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]                
Common shares reserved for future issuance (in shares)       16,965,849        
Period over which shares reserved for future issuance will increase       10 years        
Additional shares reserved for issuance, percentage       5.00%        
Expiration period       10 years        
Options granted (in shares)   0   1,500,081 4,369,866      
Weighted average grant date fair value, stock options granted (in usd per share)       $ 4.11 $ 2.05 $ 0.35    
Unrecognized compensation cost, options   $ 6,400   $ 9,700        
Fair value of stock options vested   $ 1,200 $ 500 $ 3,800 $ 1,700 $ 1,000    
Warrants, exercise price (in usd per share)       $ 7.91     $ 7.91  
Warrants outstanding (in shares)   17,916,609   17,916,609        
Total stock-based compensation   $ 6,755 783 $ 9,164 1,739 2,989    
Cost of revenue                
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]                
Total stock-based compensation   377 32 379 41 49    
Research and development                
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]                
Total stock-based compensation   2,760 60 3,141 297 1,464    
General and administrative                
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]                
Total stock-based compensation   3,294 629 2,615 1,164 1,346    
Sales and marketing                
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]                
Total stock-based compensation   $ 324 $ 62 $ 3,029 $ 237 $ 130    
Minimum                
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]                
Vesting period       1 year        
Maximum                
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]                
Vesting period       4 years        
Options                
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]                
Vesting period       36 months        
Expected dividend yield       0.00% 0.00% 0.00%    
Unrecognized compensation cost, period for recognition   1 year 2 months 4 days   1 year 1 month 17 days        
Modification incremental cost       $ 400        
Options | Share-Based Payment Arrangement, Tranche One                
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]                
Vesting percentage       25.00%        
Options | Share-Based Payment Arrangement, Tranche Two                
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]                
Vesting percentage       2.0834%        
RSUs                
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]                
Unrecognized compensation cost, period for recognition   2 years 10 months 6 days   2 years 7 months 17 days        
Granted (in usd per share)   $ 0.54   $ 5.72        
Fair value of awards vested       $ 0        
Unrecognized compensation cost, excluding options   $ 36,800   41,600        
Total stock-based compensation       $ 4,800 $ 0 $ 0    
RSUs | Share-Based Payment Arrangement, Tranche One                
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]                
Vesting percentage   25.00%            
RSUs | Share-Based Payment Arrangement, Tranche Two                
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]                
Vesting percentage   6.25%            
RSUs, Business Combination and certain executives | Share-Based Payment Arrangement, Tranche One                
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]                
Vesting percentage       50.00%        
RSUs, Business Combination and certain executives | Share-Based Payment Arrangement, Tranche Two                
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]                
Vesting percentage       25.00%        
RSUs, certain executives | Share-Based Payment Arrangement, Tranche Two                
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]                
Vesting percentage       50.00%        
RSUs, new hires | Share-Based Payment Arrangement, Tranche One                
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]                
Vesting percentage       25.00%        
RSUs, new hires | Share-Based Payment Arrangement, Tranche Two                
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]                
Vesting percentage       6.25%        
RSUs, Board of Directors                
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]                
Vesting percentage       100.00%        
2022 Plan                
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]                
Options granted (in shares)       1,500,081        
2020 Plan                
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]                
Options granted (in shares)         4,369,866      
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              
Warrants outstanding (in shares)       0        
Preferred stock warrants                
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]                
Warrants, exercise price (in usd per share)               $ 2.16
Warrants outstanding (in shares)       3,247,637        
Warrants, number of shares issuable (in shares)       2,889,282       3,247,637