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Related Party Transactions - Additional Information (Details) - USD ($)
3 Months Ended 9 Months Ended
May 29, 2018
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Jun. 30, 2020
Dec. 31, 2019
Related Party Transaction [Line Items]                
Common stock, shares owned   52,587,855   52,587,855   51,071,593    
Warrant exercised             46,869  
Change in fair value of redeemable convertible preferred stock warrant         $ 179,000      
Sutro Biopharma, Inc                
Related Party Transaction [Line Items]                
Common stock, shares owned   1,600,000   1,600,000   1,600,000    
Accrued expenses payable   $ 0   $ 0   $ 700,000    
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%   4.00%        
Percentage of royalty payment on net sales of vaccine compositions for animal health   2.00%   2.00%        
Sutro Biopharma, Inc | Supply Agreement                
Related Party Transaction [Line Items]                
Expenses related to agreement   $ 0 $ 100,000 $ 2,400,000 300,000      
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 $ 0 $ 200,000