Quarterly report pursuant to Section 13 or 15(d)

Stockholder's Equity - Additional Information (Detail)

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Stockholder's Equity - Additional Information (Detail) - $ / shares
 9 Months Ended
Sep. 30, 2019
Oct. 31, 2019
Apr. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Preferred stock, shares authorized 1,000,000     1,000,000  
Preferred stock, par value $ 0.0001     $ 0.0001  
Preferred stock, shares issued 0     0  
Preferred stock, shares outstanding 0     0  
Description of minimum Votes to be polled These provisions of the Company’s Amended and Restated Certificate of Incorporation may only be amended if approved by holders of a majority of at least 90% of the Company’s common stock voting in a stockholder meeting.        
Warrant          
Period after business combination when warrants become exercisable 30 days        
Period after offering when warrants become exercisable 12 months        
Maximum period for filing sec registration statement 15 days        
Redemption price per warrant $ 0.01        
Minimum period of prior written notice of redemption of warrants 30 days        
Minimum price per share required for redemption of warrants $ 18.00        
Warrants redemption covenant, threshold trading days 20 days        
Warrants redemption covenant, threshold consecutive trading days 30 days        
Percentage of warrants exercise price 115.00%        
Sponsor          
Percentage of shares held 20.00%        
Class A Common stock          
Common stock, shares authorized 150,000,000     150,000,000  
Common stock, par value $ 0.0001     $ 0.0001  
Common stock, voting rights per share one        
Common stock, shares issued 0     0  
Common stock, shares outstanding 0     0  
Class A Common stock | Warrant          
Exercise price of warrants $ 9.20        
Class B Common Stock          
Common stock, shares authorized 25,000,000     25,000,000  
Common stock, par value $ 0.0001     $ 0.0001  
Common stock, shares issued 7,906,250     9,487,500  
Common stock, shares outstanding 7,906,250     9,487,500  
Common stock, subject to forfeiture 1,031,250     1,237,500  
Class B Common Stock | Over-Allotment Option          
Common stock, not subject to forfeiture 1,031,250        
Class B Common Stock | Sponsor          
Common stock, shares outstanding 7,906,250   7,187,500 9,487,500 8,625,000
Common stock, subject to forfeiture   1,031,250 937,500 1,237,500 1,125,000
Percentage of shares held   20.00%