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Related Party Transactions - Additional Information (Details) - USD ($)
12 Months Ended
May 29, 2018
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Jun. 30, 2020
Related Party Transaction [Line Items]          
Common stock, shares owned   51,071,593 4,059,909    
Change in fair value of redeemable convertible preferred stock warrant   $ 179,000 $ (12,000) $ (3,000)  
Accrued expenses payable   $ 3,766,000 $ 1,305,000    
Series C Redeemable Convertible Stock          
Related Party Transaction [Line Items]          
Warrant purchase price per share     $ 11.52    
Common Stock          
Related Party Transaction [Line Items]          
Warrant purchase price per share     $ 0.79    
Common Stock Warrant | Series C Redeemable Convertible Stock          
Related Party Transaction [Line Items]          
Warrant exercised         46,869
Sutro Biopharma, Inc          
Related Party Transaction [Line Items]          
Common stock, shares owned   1,600,000 1,600,000    
Accrued expenses payable   $ 700,000 $ 0    
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   $ 1,200,000 $ 1,100,000 1,400,000  
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   $ 200,000 $ 0 $ 500,000