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Convertible Preferred Stock - Additional Information (Detail) - USD ($)
 12 Months Ended
Jul. 08, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Jul. 20, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Sale price of stock         $ 20.00
Outstanding convertible preferred stock converted into common shares 37,206,604   59,883,877    
Convertible preferred stock outstanding   0 212,642,857    
Preferred stock voting rights   The holders of the Convertible Preferred Stock had voting rights equivalent to the number of shares of common stock into which their shares of preferred stock would convert. So long as any of the Convertible Preferred Stock was outstanding, a requisite vote of the Convertible Preferred Stockholders, which was defined as a majority of the Convertible Preferred Stockholders, was required to affirm certain corporate actions, which included, but was not limited to, the disposal of assets, the acquisition of assets or a business and the authorization of additional shares of the Company’s capital. In addition, such actions required a requisite vote of the Series C preferred stockholders and a majority vote of the Series B preferred stockholders, if any of the respective preferred stock was outstanding.      
Dividends declared   $ 0 $ 0    
IPO [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Outstanding convertible preferred stock converted into common shares 61,992,534 0      
Underwritten Public Offering [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Preferred stock convertible conversion price   $ 22.80      
Outstanding convertible preferred stock converted into common shares     59,382,845    
Net proceeds from exchange of stock   $ 100,000,000      
Maximum [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Sale price of stock $ 22.80        
Series C Preferred Stock [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Preferred stock convertible conversion price $ 3.027603 $ 3.21      
Outstanding convertible preferred stock converted into common shares     35,097,955    
Issuance of common stock in public offering, net of discounts and issuance costs of $34,707, shares     1,779,093 122,850,909  
Net proceeds from exchange of stock       $ 393,587,000  
Shares price, per share     $ 3.21    
Proceeds from issuance costs     $ 5,661,000    
Convertible preferred stock outstanding     124,630,002    
Liquidation preference per share   3.21      
Series C Preferred Stock [Member] | Maximum [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Liquidation preference per share   22.80      
Series C Preferred Stock [Member] | Minimum [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Liquidation preference per share   22.80      
Series A Preferred Stock [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Outstanding convertible preferred stock converted into common shares     16,002,820    
Issuance of common stock in public offering, net of discounts and issuance costs of $34,707, shares       56,824,740  
Net proceeds from exchange of stock       $ 56,692,000  
Convertible preferred stock outstanding     56,824,740    
Liquidation preference per share   1.00      
Series B Preferred Stock [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Outstanding convertible preferred stock converted into common shares     8,783,102    
Issuance of common stock in public offering, net of discounts and issuance costs of $34,707, shares       31,188,115  
Net proceeds from exchange of stock       $ 62,876,000  
Convertible preferred stock outstanding     31,188,115    
Liquidation preference per share   $ 2.02