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Contingent Consideration - Additional Information (Detail)
$ / shares in Units, $ in Thousands
3 Months Ended 7 Months Ended 9 Months Ended 12 Months Ended
Aug. 11, 2020
day
$ / shares
shares
Jul. 15, 2020
day
$ / shares
shares
Jul. 14, 2020
$ / shares
shares
Jul. 10, 2020
day
$ / shares
shares
Jun. 10, 2020
USD ($)
day
$ / shares
shares
Dec. 31, 2020
USD ($)
$ / shares
Sep. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
$ / shares
Sep. 30, 2020
shares
Dec. 31, 2020
USD ($)
$ / shares
Dec. 31, 2019
USD ($)
$ / shares
Dec. 31, 2018
USD ($)
Jun. 11, 2020
$ / shares
Contingent Consideration [Line Items]                              
Common stock, shares issued or released (in shares) | shares                     27,187,500        
Common stock, par value (in dollars per share) | $ / shares           $ 0.01       $ 0.01   $ 0.01 $ 0.01   $ 0.01
Business combination, contingent consideration, liability, noncurrent | $         $ 347,100                    
Change in fair value of contingent consideration | $           $ 0 $ 83,130 $ 48,802 $ 0 $ 131,932   $ 131,932 $ 0 $ 0  
Reclassification of contingent consideration shares to equity | $                   (479,021)          
Common Stock                              
Contingent Consideration [Line Items]                              
Reclassification of contingent consideration shares to equity | $                       300      
Additional Paid-in Capital                              
Contingent Consideration [Line Items]                              
Contingent consideration classified as equity, fair value disclosure | $           $ 478,700       $ 478,700   $ 478,700      
Nebula Holdings LLC                              
Contingent Consideration [Line Items]                              
Number of shares issued in transaction (in shares) | shares       7,500,000                      
Business combination, number of shares issued (in shares) | shares         51,909,655                    
Nebula Holdings LLC | Contingency Consideration                              
Contingent Consideration [Line Items]                              
Number of shares issued in transaction (in shares) | shares   7,500,000     7,500,000                    
Business combination, number of shares issued (in shares) | shares         22,500,000                    
Business combination, contingent consideration, milestone period         42 months                    
Nebula Holdings LLC | Earnout Consideration                              
Contingent Consideration [Line Items]                              
Number of shares issued in transaction (in shares) | shares 7,500,000 625,000   625,000 625,000                    
Business combination, number of shares issued (in shares) | shares         22,500,000                    
Business combination, contingent consideration, milestone period         30 months                    
Contingency consideration shares (in shares) | shares         1,250,000                    
Nebula Holdings LLC | Stock Triggering Price 1 | Contingency Consideration                              
Contingent Consideration [Line Items]                              
Stock trading price (in dollars per share) | $ / shares       $ 12.00 $ 12.00                    
Business combination, consecutive threshold trading days       20 20                    
Business combination, threshold trading days       30 30                    
Business combination, period after the closing date         24 months                    
Nebula Holdings LLC | Stock Triggering Price 1 | Earnout Consideration                              
Contingent Consideration [Line Items]                              
Stock trading price (in dollars per share) | $ / shares         $ 12.00                    
Business combination, consecutive threshold trading days         20                    
Business combination, threshold trading days         30                    
Business combination, period after the closing date         24 months                    
Nebula Holdings LLC | Stock Triggering Price 2 | Contingency Consideration                              
Contingent Consideration [Line Items]                              
Stock trading price (in dollars per share) | $ / shares   $ 14.00     $ 14.00                    
Business combination, consecutive threshold trading days   20     20                    
Business combination, threshold trading days   30     30                    
Business combination, period after the closing date         30 months                    
Nebula Holdings LLC | Stock Triggering Price 2 | Earnout Consideration                              
Contingent Consideration [Line Items]                              
Stock trading price (in dollars per share) | $ / shares         $ 14.00                    
Business combination, consecutive threshold trading days         20                    
Business combination, threshold trading days         30                    
Business combination, period after the closing date         30 months                    
Nebula Holdings LLC | Stock Triggering Price 3 | Contingency Consideration                              
Contingent Consideration [Line Items]                              
Stock trading price (in dollars per share) | $ / shares         $ 16.00                    
Business combination, consecutive threshold trading days         20                    
Business combination, threshold trading days         30                    
Business combination, period after the closing date         42 months                    
Nebula Holdings LLC | Stock Triggering Price 3 | Earnout Consideration                              
Contingent Consideration [Line Items]                              
Stock trading price (in dollars per share) | $ / shares $ 16.00                            
Business combination, consecutive threshold trading days 20                            
Business combination, threshold trading days 30                            
Lock Up Shares                              
Contingent Consideration [Line Items]                              
Number of shares issued in transaction (in shares) | shares     3,437,500                        
Lock Up Shares | Stock Triggering Price 1                              
Contingent Consideration [Line Items]                              
Stock trading price (in dollars per share) | $ / shares     $ 12.00                        
Lock Up Shares | Stock Triggering Price 2                              
Contingent Consideration [Line Items]                              
Stock trading price (in dollars per share) | $ / shares     $ 14.00                        
Lock Up Shares | Nebula Holdings LLC                              
Contingent Consideration [Line Items]                              
Number of shares issued in transaction (in shares) | shares         3,437,500                    
Business combination, consecutive threshold trading days         20                    
Business combination, threshold trading days         30                    
Business combination, period after the closing date         7 years                    
Lock Up Shares | Nebula Holdings LLC | Stock Triggering Price 1                              
Contingent Consideration [Line Items]                              
Stock trading price (in dollars per share) | $ / shares         $ 12.00                    
Lock Up Shares | Nebula Holdings LLC | Stock Triggering Price 2                              
Contingent Consideration [Line Items]                              
Stock trading price (in dollars per share) | $ / shares         $ 14.00