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Summary of Significant Accounting Policies - Additional Information (Detail)
$ in Thousands
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
May 31, 2015
CNY (¥)
Sep. 30, 2024
USD ($)
Sep. 30, 2023
Sep. 30, 2024
USD ($)
Sep. 30, 2023
Dec. 31, 2023
USD ($)
Summary Of Significant Accounting Policies [Line Items]            
Cash and cash equivalents   $ 15,866   $ 15,866   $ 33,509
Long-term certificates of deposit   29,515   29,515   23,431
Short-term bank deposits   9,226   9,226    
Cash and cash equivalents, short-term bank deposits and long-term certificates of deposits exceeding China DIS coverage   $ 49,700   $ 49,700   $ 49,400
Percentage of cash and cash equivalents   72.70%   72.70%    
Percentage of short-term bank deposits and long-term certificates of deposit   100.00%   100.00%    
Cash and cash equivalents denominated in RMB   $ 11,500   $ 11,500    
Customer Concentration Risk | Sinopharm Group Co., Ltd | Revenue            
Summary Of Significant Accounting Policies [Line Items]            
Concentration of customer risk   44.80% 49.30% 47.10% 50.60%  
Customer Concentration Risk | Sinopharm Group Co., Ltd | Accounts Receivable            
Summary Of Significant Accounting Policies [Line Items]            
Concentration of customer risk       41.60%   50.50%
Customer Concentration Risk | China Resources Pharmaceutical Group Ltd | Revenue            
Summary Of Significant Accounting Policies [Line Items]            
Concentration of customer risk   12.90% 13.70% 14.60% 13.50%  
Customer Concentration Risk | Shanghai Pharmaceuticals Holding Co., Ltd | Revenue            
Summary Of Significant Accounting Policies [Line Items]            
Concentration of customer risk   12.10% 10.80% 12.10% 11.00%  
Maximum            
Summary Of Significant Accounting Policies [Line Items]            
Deposits in licensed banks protected by DIS | ¥ ¥ 500,000          
AUS 2023-07            
Summary Of Significant Accounting Policies [Line Items]            
Change in accounting principle, accounting standards update, adoption date   Jan. 01, 2024   Jan. 01, 2024    
Change in accounting principle, accounting standards update, adopted   true   true    
Change in accounting principle, accounting standards update, immaterial effect   true   true