Convertible Preferred Stock - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Class of Stock [Line Items]              
Proceeds from issuance of convertible preferred stock   $ 20,000 $ 343,410        
Series A Preferred Stock [Member]              
Class of Stock [Line Items]              
Preferred stock shares issued during the period shares             10,907,993
Preferred stock dividend per share   $ 0.04032          
Series A One Preferred Stock [Member]              
Class of Stock [Line Items]              
Preferred stock shares issued during the period shares             14,888,608
Proceeds from issuance of convertible preferred stock             $ 13,000
Preferred stock dividend per share   0.04032          
Series A And A One Preferred Stock [Member]              
Class of Stock [Line Items]              
Preferred stock issue price per share             $ 0.50394
Series B Preferred Stock [Member]              
Class of Stock [Line Items]              
Preferred stock shares issued during the period shares             21,381,446
Preferred stock issue price per share             $ 1.63693
Proceeds from issuance of convertible preferred stock             $ 35,000
Preferred stock dividend per share   0.1309          
Series C Preferred Stock [Member]              
Class of Stock [Line Items]              
Preferred stock shares issued during the period shares           39,431,582  
Preferred stock issue price per share           $ 4.06185  
Proceeds from issuance of convertible preferred stock           $ 160,200  
Payment of stock issuance costs           $ 400  
Preferred stock dividend per share   0.32495          
Series D Preferred Stock [Member]              
Class of Stock [Line Items]              
Preferred stock shares issued during the period shares       9,923,792 42,910,925    
Preferred stock issue price per share       $ 4.53456 $ 4.53456    
Proceeds from issuance of convertible preferred stock       $ 45,000 $ 194,600    
Payment of stock issuance costs       $ 500 $ 300    
Preferred stock dividend per share   $ 0.362764          
Class B Common Stock              
Class of Stock [Line Items]              
Common Stock Issuable Upon Conversion 139,444,346