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Leases - Additioinal Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 27, 2024
Sep. 30, 2024
Sep. 30, 2024
Dec. 31, 2023
Lessee, Lease, Description [Line Items]        
Lessee, Operating Lease, Existence of Option to Terminate [true false]     true  
Lessee, Operating Lease, Option to Terminate     As part of its continuing efforts to reduce operating expenses and preserve cash, on September 27, 2024, the Company entered into an Agreement for Termination of Lease and Voluntary Surrender of Premises (“Lease Termination Agreement”) with its landlord, ARE-San Francisco No.43 Owner, LLC (“ARE”) related to the Company’s operating lease of its corporate headquarters in San Francisco, California. The Lease Termination Agreement modifies the lease agreement dated as of September 22, 2006, as subsequently amended and accelerates the expiration date of the term of the Lease from 2028 to no later than December 31, 2024.  
Lease termination settlement amount $ 10,000      
Lease termination settlement one time cash payment 8,300      
Lease termination, remaining security deposit $ 1,700      
Gain on lease termination   $ 1,700    
Operating lease right-of-use assets   2,093 $ 2,093 $ 68,093
Operating lease liability   2,000 2,000  
Derecognized [Member]        
Lessee, Lease, Description [Line Items]        
Operating lease right-of-use assets   56,100 56,100  
Operating lease liability   68,500 68,500  
Shanghai and Beijing, China [Member]        
Lessee, Lease, Description [Line Items]        
Operating lease liability   $ 2,100 $ 2,100  
Minimum [Member] | Shanghai and Beijing, China [Member]        
Lessee, Lease, Description [Line Items]        
Lessee, operating lease, expiration period     2025  
Maximum [Member] | Shanghai and Beijing, China [Member]        
Lessee, Lease, Description [Line Items]        
Lessee, operating lease, expiration period     2027