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Convertible Preferred Stock and Stockholders' Equity - Additional Information (Details) - $ / shares
 12 Months Ended
Oct. 16, 2017
Jun. 21, 2017
Dec. 31, 2019
Dec. 31, 2018
Oct. 11, 2017
Class Of Stock [Line Items]          
Preferred stock, shares authorized 10,000,000 11,091,782     11,091,782
Preferred stock, par value $ 0.001 $ 0.001      
Percentage of common stock exercise price adjusted   0.167%      
Percentage of common stock fair value adjusted prior to recapitalization   0.167%      
Common stock exercise feature     the number of shares of common stock as to which each outstanding option to purchase common stock was exercisable for and each outstanding RSU was convertible into was adjusted such that upon exercise of outstanding stock options or vesting of outstanding RSUs, each holder would receive two fully paid and non‑assessable shares of Class A common stock and four fully paid and non‑assessable shares of Class B common stock in respect of each share of common stock previously underlying such option or RSU    
Conversion of convertible securities into shares of common stock 9,091,484        
Preferred stock, shares outstanding 0   0 0  
IPO          
Class Of Stock [Line Items]          
Preferred stock, shares outstanding 0        
Class A Common Stock          
Class Of Stock [Line Items]          
Common stock, shares authorized 500,000,000 120,020,700 500,000,000 500,000,000  
Common stock, par value $ 0.001 $ 0.001 $ 0.001 $ 0.001  
Common stock conversion terms     each share of Class A common stock issued and outstanding was recapitalized, reclassified, and reconstituted into two fully paid and non‑assessable shares of outstanding Class A common stock and four fully paid and non‑assessable shares of outstanding Class B common stock    
Number of shares issued upon exercise of outstanding stock options or vesting of outstanding RSUs   2      
Conversion of convertible securities into shares of common stock 60,564,678        
Class A Common Stock | IPO          
Class Of Stock [Line Items]          
Conversion of convertible securities into shares of common stock 20,188,226        
Class A Common Stock | Class A Common Stock Recapitalized, Reclassified And Reconstituted [Member]          
Class Of Stock [Line Items]          
Common stock issued in conversion   2      
Class A Common Stock | Class B Common Stock Recapitalized, Reclassified And Reconstituted [Member]          
Class Of Stock [Line Items]          
Common stock issued in conversion   2      
Class A Common Stock | Subsequent Conversion          
Class Of Stock [Line Items]          
Conversion of convertible securities into shares of common stock 40,376,452        
Class B Common Stock          
Class Of Stock [Line Items]          
Common stock, shares authorized 100,000,000 80,013,800 100,000,000 100,000,000  
Common stock, par value $ 0.001 $ 0.001 $ 0.001 $ 0.001  
Common stock conversion terms     each share of Class B common stock of the Company issued and outstanding was recapitalized, reclassified, and reconstituted into two fully paid and non‑assessable shares of outstanding Class A common stock and four fully paid and non‑assessable shares of outstanding Class B common stock    
Number of shares issued upon exercise of outstanding stock options or vesting of outstanding RSUs   4      
Conversion of convertible securities into shares of common stock 40,376,452        
Class B Common Stock | Class A Common Stock Recapitalized, Reclassified And Reconstituted [Member]          
Class Of Stock [Line Items]          
Common stock issued in conversion   4      
Class B Common Stock | Class B Common Stock Recapitalized, Reclassified And Reconstituted [Member]          
Class Of Stock [Line Items]          
Common stock issued in conversion   4      
Series A Preferred Stock          
Class Of Stock [Line Items]          
Preferred stock, shares authorized   3,333,000     3,333,000
Series B Preferred Stock          
Class Of Stock [Line Items]          
Preferred stock, shares authorized   3,329,497     3,329,497
Series D Preferred Stock          
Class Of Stock [Line Items]          
Preferred stock, shares authorized   1,673,105     1,673,105
Series C Preferred Stock          
Class Of Stock [Line Items]          
Preferred stock, shares authorized   1,648,978     1,648,978
Series E Preferred Stock          
Class Of Stock [Line Items]          
Preferred stock, shares authorized   1,107,202     1,107,202