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Related Party Transactions - Additional Information (Details) - USD ($)
12 Months Ended
May 29, 2018
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Oct. 31, 2022
Jan. 31, 2022
Dec. 31, 2019
Related Party Transaction [Line Items]              
Common stock, shares owned   79,470,670 53,031,978        
Warrant exercised   0     0.001 0.001  
Sutro Biopharma, Inc              
Related Party Transaction [Line Items]              
Common stock, shares owned     1,600,000 1,600,000      
Sutro Biopharma, Inc | License Agreement              
Related Party Transaction [Line Items]              
Percentage of royalty payment on annual net sales of vaccine products for human health   4.00%          
Percentage of royalty payment on net sales of vaccine compositions for animal health   2.00%          
Sutro Biopharma, Inc | Supply Agreement              
Related Party Transaction [Line Items]              
Expenses related to agreement   $ 0.0 $ 2,400,000 $ 1,200,000      
Sutro Biopharma, Inc | Series C Redeemable Convertible Stock              
Related Party Transaction [Line Items]              
Warrant to purchase shares of stock             59,276
Warrant purchase price per share             $ 11.5215
Sutro Biopharma, Inc | Series C Redeemable Convertible Stock | License Amendment A2              
Related Party Transaction [Line Items]              
Warrant to purchase shares of stock 59,276            
Warrant purchase price per share $ 11.5215            
Warrant exercisable and vests immediately and expires date May 29, 2018            
Sutro Biopharma, Inc | Common Stock              
Related Party Transaction [Line Items]              
Warrant to purchase shares of stock             31,857
Warrant purchase price per share             $ 0.79289
Sutro Biopharma, Inc | Common Stock Warrant              
Related Party Transaction [Line Items]              
Warrant exercised             30,278
Sutro Biopharma, Inc | Preferred Stock Warrant              
Related Party Transaction [Line Items]              
Warrant exercised             16,591
Change in fair value of redeemable convertible preferred stock warrant   $ 0 $ 0 $ 200,000