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Related Party Transactions (Detail) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 16, 2019
Aug. 13, 2019
Jun. 25, 2019
Sep. 30, 2020
Aug. 31, 2020
Jun. 30, 2020
Dec. 31, 2019
Sep. 16, 2019
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Feb. 03, 2021
Dec. 26, 2019
Sep. 19, 2019
Related Party Transaction [Line Items]                                  
Request for redemption on Common stock             182,432                    
Common stock, shares issued             9,702,831   11,640,181   9,702,831 11,513,451 9,702,831        
Common stock, shares outstanding             9,702,831   11,640,181   9,702,831 11,513,451 9,702,831        
Description of founder shares                       The conversion ratio at each balance sheet date presented was share of common stock for one share of preferred stock.          
Administrative expense                       $ 36,872,000 $ 24,614,000 $ 19,102,000      
Series C Preferred Stock [Member]                                  
Related Party Transaction [Line Items]                                  
Stock issued during period             4,832,409                    
Share price             $ 31.0404       $ 31.0404   $ 31.0404     $ 31.04  
proceeds from issue of preferred stock             $ 150,000,000                    
Nonvoting Common Stock [Member]                                  
Related Party Transaction [Line Items]                                  
Stock purchased in period       631,431   722,734 97,735                    
Shares Purchased Price       $ 53.40   $ 32.889 $ 32.889       $ 32.889   $ 32.889        
Stock purchased during period       $ 33.7   $ 23.8 $ 16.4       $ 16.4   $ 16.4        
Series B 1 Convertible Preferred Stock [Member]                                  
Related Party Transaction [Line Items]                                  
stock redeemed during period, Shares         694,498   2,631,842                    
Series B2 Convertible Preferred Stock [Member]                                  
Related Party Transaction [Line Items]                                  
stock redeemed during period, Shares         351,445   2,385,032                    
Convertible Preferred Stock                                  
Related Party Transaction [Line Items]                                  
stock redeemed during period, value         $ 34.4   $ 165.0                    
Apex Technology Acquisition Corp [Member]                                  
Related Party Transaction [Line Items]                                  
Share price                 $ 10.00     $ 10.00          
Shares subject to forfeiture of over-allotment option                 1,143,750     1,143,750          
Percentage of issued and outstanding shares                 20.00%     20.00%          
Convertible debt                 $ 1,500,000     $ 1,500,000          
Conversion price                 $ 10.00     $ 10.00          
Administrative expense $ 15,000               $ 15,000                
Fees for services                 $ 45,000 $ 45,000 50,500 $ 180,000          
Apex Technology Acquisition Corp [Member] | Initial Public Offering [Member]                                  
Related Party Transaction [Line Items]                                  
Share price                                 $ 10.00
Borrowings outstanding             $ 275,000       $ 275,000   $ 275,000        
Apex Technology Acquisition Corp [Member] | Common Class B One [Member]                                  
Related Party Transaction [Line Items]                                  
Founder shares                     7,187,500   7,187,500        
Founder shares, value                     $ 25,000   $ 25,000        
Common stock dividend payment terms   1.1 for 1           1.109091 for 1                  
Common stock, shares issued 8,768,750 8,768,750           8,768,750                  
Common stock, shares outstanding 8,768,750 8,768,750           8,768,750                  
Description of founder shares                 (A) one year after the completion of a Business Combination or (B) subsequent to a Business Combination, (x) if the last sale price of the Class A common stock equals or exceeds $12.00 per share (as adjusted for stock splits, stock dividends, reorganizations, recapitalizations and the like) for any 20 trading days within any 30-trading day period commencing at least 150 days after a Business Combination, or (y) the date on which the Company completes a liquidation, merger, capital stock exchange or other similar transaction that results in all of the Company’s stockholders having the right to exchange their shares of common stock for cash, securities or other property.     (A) one year after the completion of a Business Combination or (B) subsequent to a Business Combination, (x) if the last sale price of the Class A common stock equals or exceeds $12.00 per share (as adjusted for stock splits, stock dividends, reorganizations, recapitalizations and the like) for any 20 trading days within any 30-trading day period commencing at least 150 days after a Business Combination, or (y) the date on which the Company completes a liquidation, merger, capital stock exchange or other similar transaction that results in all of the Company’s stockholders having the right to exchange their shares of common stock for cash, securities or other property.          
Apex Technology Acquisition Corp [Member] | Founder Shares [Member]                                  
Related Party Transaction [Line Items]                                  
Founder Shares no longer subject to forfeiture                 1,125,000     1,125,000          
Shares issued                 8,750,000   8,750,000 8,750,000          
Shares outstanding                 8,750,000   8,750,000 8,750,000          
Over-Allotment Option [Member] | Apex Technology Acquisition Corp [Member] | Founder Shares [Member]                                  
Related Party Transaction [Line Items]                                  
Shares subject to forfeiture of over-allotment option                 18,750     18,750          
Sponsor [Member] | Apex Technology Acquisition Corp [Member]                                  
Related Party Transaction [Line Items]                                  
Additional borrowings     $ 300,000                            
Conversion price                             $ 10.00    
Debt Instrument, Annual Principal Payment (in Dollars)                             $ 300,000    
Outstanding balance amount (in Dollars)                 $ 300,000