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Related Party Transactions - Additional Information (Details)
6 Months Ended 12 Months Ended
Oct. 22, 2018
shares
Aug. 30, 2018
USD ($)
Nov. 03, 2017
USD ($)
$ / shares
shares
Jun. 30, 2019
USD ($)
$ / shares
shares
Jun. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Sep. 11, 2018
$ / shares
Related Party Transaction [Line Items]              
Share price (in dollars per share) | $ / shares             $ 10.00
Class A Common Stock              
Related Party Transaction [Line Items]              
Number of shares warrant may be converted | shares       1      
Warrants exercise price (in dollars per share) | $ / shares       $ 11.50      
Founder Shares              
Related Party Transaction [Line Items]              
Outstanding shares of common stock held by the initial stockholders (as a percent) 20.00%            
Founder Shares | Class A Common Stock              
Related Party Transaction [Line Items]              
Conversion ratio       1      
Founder Shares | Sponsor              
Related Party Transaction [Line Items]              
Number of shares forfeited | shares 781,250            
Founder Shares | Sponsor | Class F Common Stock              
Related Party Transaction [Line Items]              
Sale of common stock (in shares) | shares     10,781,250        
Sale of common stock, value | $     $ 25,000        
Share price (in dollars per share) | $ / shares     $ 0.002        
Founder Shares | Director              
Related Party Transaction [Line Items]              
Number of shares transferred | shares     75,000        
Private Placement Warrants | Class A Common Stock              
Related Party Transaction [Line Items]              
Number of shares warrant may be converted | shares       1      
Warrants exercise price (in dollars per share) | $ / shares       $ 11.50      
Private Placement Warrants | Sponsor              
Related Party Transaction [Line Items]              
Number of warrants sold | shares     6,666,666        
Warrants sold, price per warrant | $ / shares     $ 1.50        
Proceeds from sale of Private Placement Warrants to Sponsor | $     $ 10,000,000        
Sponsor Loan              
Related Party Transaction [Line Items]              
Promissory note to related party | $     300,000        
Proceeds from Promissory Note to related party | $   $ 150,000 $ 150,000        
Administrative Service Agreement | Affiliate of the Sponsor              
Related Party Transaction [Line Items]              
Monthly charge for administrative services | $       $ 20,000      
Transactions during the period | $         $ 120,000 $ 76,000