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Significant Accounting Policies - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Summary of Significant Accounting Policies (Details) [Line Items]    
Accumulated deficit $ (910,743) $ (342,804)
Net cash used in operating activities $ (130,413) (67,999)
Sale of Stock, Description of Transaction the exercise of the Warrants may be settled in cash upon the occurrence of a tender offer or exchange that involves more than 50% of the outstanding shares of the Company’s Common Stock.  
Cash and cash equivalents and marketable securities $ 502,700  
Warrants to purchase common stock outstanding 5,787,472  
Class of warrant or right, exercise price of warrants or rights $ 11.5  
Operating lease right-of-use assets $ 2,402 3,605
Current operating lease liabilities 1,663 1,972
Non-current operating lease liabilities 969 2,035
AnHeart [Member]    
Summary of Significant Accounting Policies (Details) [Line Items]    
Revenue From Contract With Customer Including Assessed Tax   $ 0
China [Member]    
Summary of Significant Accounting Policies (Details) [Line Items]    
Revenue From Contract With Customer Including Assessed Tax 5,200  
Japan [Member]    
Summary of Significant Accounting Policies (Details) [Line Items]    
Revenue From Contract With Customer Including Assessed Tax $ 2,700  
UNITED STATES [Member]    
Summary of Significant Accounting Policies (Details) [Line Items]    
Percentage of long-lived assets 90.00%  
Other than U.S. [Member]    
Summary of Significant Accounting Policies (Details) [Line Items]    
Percentage of long-lived assets 10.00%  
Computer Equipment [Member]    
Summary of Significant Accounting Policies (Details) [Line Items]    
Property and equipment, estimated useful life 5 years  
Furniture and Equipment [Member]    
Summary of Significant Accounting Policies (Details) [Line Items]    
Property and equipment, estimated useful life 7 years  
Class A Common Stock [Member]    
Summary of Significant Accounting Policies (Details) [Line Items]    
Warrants to purchase common stock outstanding 5,787,472  
Sales Revenue Net [Member] | Customer Concentration Risk [Member]    
Summary of Significant Accounting Policies (Details) [Line Items]    
Concentration Risk Threshold Percentage 10.00% 10.00%
Accounts Receivable [Member] | Customer Concentration Risk [Member]    
Summary of Significant Accounting Policies (Details) [Line Items]    
Concentration Risk Threshold Percentage 10.00%  
Public Warrants [Member]    
Summary of Significant Accounting Policies (Details) [Line Items]    
Warrants to purchase common stock outstanding 4,791,639  
Private Placement Warrants [Member]    
Summary of Significant Accounting Policies (Details) [Line Items]    
Warrants to purchase common stock outstanding 162,500  
Forward Purchase Warrants [Member]    
Summary of Significant Accounting Policies (Details) [Line Items]    
Warrants to purchase common stock outstanding 833,333  
Consideration Warrants [Member] | Class A Common Stock [Member]    
Summary of Significant Accounting Policies (Details) [Line Items]    
Warrants to purchase common stock outstanding 2,893,720  
Class of warrant or right, exercise price of warrants or rights $ 11.5  
Fair Value O fWarrants Trading Price $ 0.26