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Net Loss Per Share - Schedule of Basic and Diluted Net Loss Per Share Attributable to Stockholders (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 8 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2024
Sep. 30, 2025
Schedule of Basic and Diluted Net Loss Per Share Attributable to Stockholders [Line Items]        
Net loss $ (30,277) $ (28,623) $ (57,943) $ (75,850)
Common Stock [Member]        
Schedule of Basic and Diluted Net Loss Per Share Attributable to Stockholders [Line Items]        
Net loss $ (24,042) $ (21,936) $ (47,192) $ (59,813)
Weighted average shares outstanding – Basic 44,067,059 15,013,655 7,765,381 42,622,935
Weighted average shares outstanding – Diluted 44,067,059 15,013,655 7,765,381 42,622,935
Loss Per Share - Basic $ (0.55) $ (1.46) $ (6.08) $ (1.4)
Loss Per Share - Diluted $ (0.55) $ (1.46) $ (6.08) $ (1.4)
Series A Non-Voting Convertible Preferred Stockholders [Member]        
Schedule of Basic and Diluted Net Loss Per Share Attributable to Stockholders [Line Items]        
Net loss [1] $ (697) [1] $ (1,121) [2] [2]
Weighted average shares outstanding – Basic [1] 477 [1] 184 [2] [2]
Weighted average shares outstanding – Diluted [1] 477 [1] 184 [2] [2]
Loss Per Share - Basic [1] $ (1,461.1) [1] $ (6,077.25) [2] [2]
Loss Per Share - Diluted [1] $ (1,461.1) [1] $ (6,077.25) [2] [2]
Series B Non-Voting Convertible Preferred Stockholders [Member]        
Schedule of Basic and Diluted Net Loss Per Share Attributable to Stockholders [Line Items]        
Net loss $ (6,235) [3] $ (5,990) [3] $ (9,630) [4] $ (16,037) [4]
Weighted average shares outstanding – Basic 137,138 [3] 49,191 [3] 19,015 [4] 137,138 [4]
Weighted average shares outstanding – Diluted 137,138 [3] 49,191 [3] 19,015 [4] 137,138 [4]
Loss Per Share - Basic $ (45.46) [3] $ (121.76) [3] $ (506.44) [4] $ (116.94) [4]
Loss Per Share - Diluted $ (45.46) [3] $ (121.76) [3] $ (506.44) [4] $ (116.94) [4]
[1] The weighted-average number of shares of as-converted Company Series A Preferred Stock used in the loss allocation was nil and 477,196 for the three months ended September 30, 2025 and September 30, 2024, respectively.
[2] The weighted-average number of shares of as-converted Company Series A Preferred Stock used in the loss allocation was nil and 184,462 for the nine months ended September 30, 2025 and the period from February 6, 2024 (Inception) to September 30, 2024, respectively.
[3] The weighted-average number of shares of as-converted Company Series B Preferred Stock used in the loss allocation was 11,428,129 and 4,099,227 for the three months ended September 30, 2025 and September 30, 2024, respectively.
[4] The weighted-average number of shares of as-converted Company Series B Preferred Stock used in the loss allocation was 11,428,129 and 1,584,575 for the nine months ended September 30, 2025 and the period from February 6, 2024 (Inception) to September 30, 2024, respectively.