v3.24.4
Stock-based Compensation - Schedule of Stock-Based Compensation Expense (FY) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Consulting expense $ 1,707 $ 2,156 $ 4,885 $ 6,453 $ 8,480 $ 11,580
Options            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Consulting expense 71 81 216 269 352 538
RSUs & RSAs            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Consulting expense 1,636 2,068 4,669 6,167 8,115 10,995
ESPP            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Consulting expense 0 7 0 17 13 117
Performance Awards            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Consulting expense         0 (70)
Research and development expenses            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Consulting expense 275 472 499 1,629 2,131 2,134
Selling, general and administrative expenses            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Consulting expense $ 1,432 $ 1,684 $ 4,386 $ 4,824 $ 6,349 $ 9,446