Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies - Additional information (Details)

v3.19.3.a.u2
Commitments and Contingencies - Additional information (Details) - $ / shares
12 Months Ended 24 Months Ended
Jan. 09, 2018
Sep. 30, 2019
Sep. 30, 2019
Nov. 30, 2019
Sep. 27, 2019
Sep. 30, 2018
Dec. 12, 2017
Commitments And Contingencies [Line Items]              
Underwriters option period     45 days        
Sale price per unit   $ 10.00 $ 10.00     $ 10.00 $ 10.00
Business combination marketing agreement, advisors fee percentage description   Pursuant to that agreement, the Company will pay the Advisors a cash fee for such services upon the consummation of the Business Combination in an amount equal to, in the aggregate, (i) 3.5% of the gross proceeds of the Offering, excluding any proceeds from the full or partial exercise of the over-allotment option, plus (ii) 5.033333% of the gross proceeds of the Offering, if any, from the full or partial exercise of the over-allotment option (in each case, exclusive of any applicable finders’ fees which might become payable)          
Advisors fee on gross proceeds of offering excluding over-allotment option percentage   3.50% 3.50%        
Advisors fee on gross proceeds of offering from over-allotment option percentage   5.03333% 5.03333%        
Greenhaven | Subsequent Event              
Commitments And Contingencies [Line Items]              
Exercise price of warrants       $ 10.50      
1.05 Per Right For First 5,500,000 Rights | Forward Share Purchase Agreement              
Commitments And Contingencies [Line Items]              
Exercise price of warrants         $ 1.05    
Number of additional rights acquired         5,500,000    
Reflects $10.50 Per Share For First 550,000 Shares | Forward Share Purchase Agreement              
Commitments And Contingencies [Line Items]              
Exercise price of warrants         $ 10.50    
Number of additional rights acquired         550,000    
1.07 Per Right For Next 2,500,000 Rights | Forward Share Purchase Agreement              
Commitments And Contingencies [Line Items]              
Exercise price of warrants         $ 1.07    
Number of additional rights acquired         2,500,000    
Reflects $10.70 Per Share For Next 250,000 Shares | Forward Share Purchase Agreement              
Commitments And Contingencies [Line Items]              
Exercise price of warrants         $ 10.70    
Number of additional rights acquired         250,000    
1.10 Per Right For Next 2,000,000 Rights | Forward Share Purchase Agreement              
Commitments And Contingencies [Line Items]              
Exercise price of warrants         $ 1.10    
Number of additional rights acquired         11.00    
Reflects $11.00 Per Share For Next 200,000 Shares | Forward Share Purchase Agreement              
Commitments And Contingencies [Line Items]              
Exercise price of warrants         $ 2,000,000    
Number of additional rights acquired         200,000    
Over-Allotment Option              
Commitments And Contingencies [Line Items]              
Number of additional shares granted     1,875,000        
Number of additional units purchased by underwriters 1,875,000            
Sale price per unit $ 10.00            
Underwriting discount, per unit on offering price 0.20            
Underwriting discount, per unit sold $ 0.0467            
Open Market | Forward Share Purchase Agreement | Greenhaven              
Commitments And Contingencies [Line Items]              
Exercise price of warrants         $ 10.50