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Significant Accounting Policies - Additional Information (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 11, 2018
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Significant Accounting Policies [Line Items]          
Cash balance, federal depository insurance coverage     $ 250,000    
Shares subject to possible redemption, issued     38,714,829   38,398,161
Accrued interest and penalties related to unrecognized tax liabilities     $ 0    
Investments and cash held in Trust Account $ 400,000,000   $ 407,067,134   $ 402,605,952
Redemption percentage if business combination is not completed     100.00%    
Dissolution expenses, maximum allowed     $ 100,000    
Redemption rights or liquidating distributions with respect to warrants     0    
Current liabilities     2,470,041   687,370
Working capital     (1,227,177)   $ 375,661
Maximum          
Significant Accounting Policies [Line Items]          
Threshold net tangible assets     $ 5,000,001    
Number of days to redeem the shares if Business combination is not completed     10 days    
Class A Common Stock          
Significant Accounting Policies [Line Items]          
Sale of common stock   40,000,000   40,000,000  
Shares subject to possible redemption, issued   38,241,399 38,714,829 38,241,399 38,398,161
IPO          
Significant Accounting Policies [Line Items]          
Offering costs including underwriters fees 22,756,432        
Underwriter's fees $ 22,000,000        
IPO | Maximum          
Significant Accounting Policies [Line Items]          
Threshold net tangible assets     $ 5,000,001    
IPO | Class A Common Stock          
Significant Accounting Policies [Line Items]          
Sale of common stock     40,000,000