v3.24.4
Income Taxes - Schedule of Reconciliation of Effective Income Tax Rate (FY) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2024
Sep. 30, 2024
Dec. 31, 2023
Dec. 31, 2022
Effective Income Tax Rate Reconciliation, Amount [Abstract]        
Tax provision (benefit) at U.S. statutory rate     $ (14,473) $ (20,042)
State income taxes, net of federal benefit     (6,694) 11,113
Non-deductible expenses     261 (60)
Change in value of equity instruments     (118) (1,089)
Deferred adjustments     (56) (143)
Other     (172) 0
Research and development credits     (274) (1,085)
IRC Sec. 174     217 0
Uncertain tax positions     69 276
Change in valuation allowance     21,240 11,030
Income tax provision     $ 0 $ 0
Effective Income Tax Rate Reconciliation, Percent [Abstract]        
Tax provision (benefit) at U.S. statutory rate     21.00% 21.00%
State income taxes, net of federal benefit     9.70% (11.60%)
Non-deductible expenses     (0.40%) 0.10%
Change in value of equity instruments     0.20% 1.10%
Deferred adjustments     0.10% 0.20%
Other     0.30% 0.00%
Research and development credits     0.40% 1.10%
IRC Sec. 174     (0.30%) 0.00%
Uncertain tax positions     (0.10%) (0.30%)
Change in valuation allowance     (30.80%) (11.60%)
Effective Rate 0.00% 0.00% 0.00% 0.00%