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Nature of the Business and Basis of Presentation (Details) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended 8 Months Ended 9 Months Ended 11 Months Ended
Oct. 03, 2025
Sep. 17, 2025
Sep. 03, 2024
Nov. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2024
Sep. 30, 2025
Dec. 31, 2024
Sep. 13, 2024
Nature of the Business and Basis of Presentation [Line Items]                    
Common stock, par value (in Dollars per share)         $ 0.001     $ 0.001 $ 0.001  
Additional paid-in capital transaction costs     $ 20,500              
Gross offering proceeds             $ 109    
Incurred net loss         $ (30,277) $ (28,623) (57,943) (75,850)    
Net cash operating activities             (39,019) (65,616)    
Cash, cash equivalents, and marketable securities         500,900     500,900    
Pre-funded Warrants [Member]                    
Nature of the Business and Basis of Presentation [Line Items]                    
Aggregate gross proceeds                 $ 188,700  
Purchase price per share (in Dollars per share)                   $ 22.999
Net of issuance costs                 $ 11,900  
Common Stock [Member]                    
Nature of the Business and Basis of Presentation [Line Items]                    
Exchange ratio                 6.8569  
Conversion ratio                 83.3332:1  
Prefunded warrants to purchase an aggregate shares (in Shares)                 680,000  
ARCA [Member]                    
Nature of the Business and Basis of Presentation [Line Items]                    
Cash Balance         4,940     4,940    
Common Stock [Member]                    
Nature of the Business and Basis of Presentation [Line Items]                    
Convertible shares (in Shares)       2,439,000            
Incurred net loss         $ (24,042) $ (21,936) $ (47,192) (59,813)    
Series A Non-Voting Convertible Preferred Stock [Member]                    
Nature of the Business and Basis of Presentation [Line Items]                    
Purchase price per share (in Dollars per share)                   23,000
Series A Preferred Stock [Member]                    
Nature of the Business and Basis of Presentation [Line Items]                    
Convertible shares (in Shares)       2,439         1,000  
Oruka Common Stock [Member]                    
Nature of the Business and Basis of Presentation [Line Items]                    
Reverse stock split     1-for-12              
Common stock, par value (in Dollars per share)     $ 0.001              
Pre-Merger Oruka [Member] | Pre-funded Warrants [Member]                    
Nature of the Business and Basis of Presentation [Line Items]                    
Aggregate gross proceeds     $ 275,000              
Proceeds from issuance of convertible note     $ 25,000              
Oruka Series A Convertible Preferred Stock [Member]                    
Nature of the Business and Basis of Presentation [Line Items]                    
Common stock, par value (in Dollars per share)                 $ 0.0001  
ARCA Series B non-voting convertible preferred stock [Member]                    
Nature of the Business and Basis of Presentation [Line Items]                    
Common stock, par value (in Dollars per share)                 0.001  
PIPE Financing [Member] | Pre-funded Warrants [Member]                    
Nature of the Business and Basis of Presentation [Line Items]                    
Common stock, par value (in Dollars per share)   $ 14.999                
Aggregate gross proceeds               169,600    
Net of issuance costs               $ 10,400    
PIPE Financing [Member] | Common Stock [Member]                    
Nature of the Business and Basis of Presentation [Line Items]                    
Aggregate of purchased shares (in Shares)   10,933,405                
Purchase price per share (in Dollars per share)   $ 15               $ 23
Aggregate shares (in Shares)   1,066,666                
PIPE Financing [Member] | Common Stock [Member]                    
Nature of the Business and Basis of Presentation [Line Items]                    
Aggregate of purchased shares (in Shares)                   5,600,000
PIPE Financing [Member] | Series A Non-Voting Convertible Preferred Stock [Member]                    
Nature of the Business and Basis of Presentation [Line Items]                    
Common stock, par value (in Dollars per share)                 $ 0.001  
Aggregate shares (in Shares)                 2,439  
PIPE Financing [Member] | Series A Preferred Stock [Member]                    
Nature of the Business and Basis of Presentation [Line Items]                    
Purchase price per share (in Dollars per share)           $ 23,000 $ 23,000      
ATM Offering [Member] | Subsequent Event [Member]                    
Nature of the Business and Basis of Presentation [Line Items]                    
Gross offering proceeds $ 200,000