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Principal Accounting Policies - Narrative (Details)
 12 Months Ended
Dec. 31, 2024
USD ($)
Segment
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Finite-Lived Intangible Assets [Line Items]      
Cash equivalents $ 20,900,000 $ 16,200,000  
Short-term investments 2,787,000 7,983,000  
Cash and cash equivalents restricted cash, short-term investments, long-term investments and held-for-sale assets 370,300,000    
Impairment of short-term investments 0 0 $ 0
Impairment of long-lived assets (excluding goodwill) 0 0 0
Impairment of long-lived assets 0 0 0
Interest income 16,900,000 18,800,000 9,600,000
Interest expense 253,000 20,000  
Interest expense net 300,000 20,100 0
Interest expense capitalized $ 500,000 14,800 0
Value added tax rate 6.00%    
Advances from customers $ 8,738,000 7,765,000  
Contract with customer, liability, revenue recognized 3,200,000 8,400,000 5,600,000
Advertising expenses 1,400,000 1,900,000 3,400,000
Deferred tax liabilities, uncertain tax positions 0 0 0
Dividends $ 0 0 $ 0
Segment Reporting, CODM, Individual Title and Position or Group Name [Extensible Enumeration] Chief Executive Officer [Member]    
Segment Reporting, CODM, Profit (Loss) Measure, How Used, Description The primary measure of segment profitability for the Company’s operating segment is considered to be consolidated net loss. Net loss is used by the CODM to monitor budget versus actual results as well as comparation with the Group’s competitors, which are used in assessing performance of the segment.    
Number of operating segments | Segment 1    
Number of reportable segments | Segment 1    
Operating lease right-of-use assets $ 3,866,000 4,011,000  
Operating lease, liability $ 3,671,000    
Measurement period 1 year    
Contract with customer, Asset after allowance for credit loss $ 1,100,000 $ 1,000,000  
Land [Member]      
Finite-Lived Intangible Assets [Line Items]      
Property equipment, useful life 50 years    
Measurement Input, Discount Rate [Member] | Level 3 [Member]      
Finite-Lived Intangible Assets [Line Items]      
Discount rate 21.00%    
No Individual Customer | Revenue Benchmark [Member] | Customer Concentration Risk [Member]      
Finite-Lived Intangible Assets [Line Items]      
Concentration risk, percentage 10.00% 10.00% 10.00%
No Individual Customer | Accounts Receivable [Member] | Customer Concentration Risk [Member]      
Finite-Lived Intangible Assets [Line Items]      
Concentration risk, percentage 10.00% 10.00%  
SINGAPORE      
Finite-Lived Intangible Assets [Line Items]      
Percentage of deposits held by financial institutions 39.00%    
UNITED STATES      
Finite-Lived Intangible Assets [Line Items]      
Percentage of deposits held by financial institutions 23.00%    
PRC      
Finite-Lived Intangible Assets [Line Items]      
Percentage of deposits held by financial institutions 19.00%    
HONG KONG      
Finite-Lived Intangible Assets [Line Items]      
Percentage of deposits held by financial institutions 13.00%    
Other International      
Finite-Lived Intangible Assets [Line Items]      
Percentage of deposits held by financial institutions 6.00%    
Minimum      
Finite-Lived Intangible Assets [Line Items]      
Finite-lived intangible asset, useful life 3 years    
Maximum      
Finite-Lived Intangible Assets [Line Items]      
Finite-lived intangible asset, useful life 5 years