Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity - Additional Information (Details)

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Stockholders' Equity - Additional Information (Details) - USD ($)
12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Dec. 11, 2019
Nov. 25, 2019
Dec. 12, 2017
Oct. 08, 2017
Class Of Stock [Line Items]            
Common stock, shares authorized 100,000,000 100,000,000        
Common stock, shares issued 4,453,975 4,152,789        
Common stock, shares outstanding 4,453,975 4,152,789        
Preferred stock, shares authorized 1,000,000 1,000,000        
Preferred stock, shares issued 0 0        
Preferred stock, shares outstanding 0 0        
Subsequent Event            
Class Of Stock [Line Items]            
Common stock, shares issued       19,977,101    
Common stock, shares outstanding       19,977,101    
Rights            
Class Of Stock [Line Items]            
Number of shares of common stock each holder receive         0.10  
Period allotted to complete the business combination 24 months          
Warrants or rights outstanding 14,873,256 14,873,256        
Number of fractional shares issued upon conversion of rights 0          
Additional consideration required to be paid by holder of right to receive additional shares $ 0          
Funds and distributions to be received by rights holders upon liquidation of funds held in trust account 0          
Contractual penalties for failure to deliver securities to the rights holders $ 0          
Rights | Subsequent Event            
Class Of Stock [Line Items]            
Exercise price of warrants     $ 0.99      
Common Stock            
Class Of Stock [Line Items]            
Common stock, shares authorized 100,000,000          
Common stock, voting rights per share one          
Common stock, shares issued 4,453,975 4,152,789        
Common stock, shares outstanding 4,453,975 4,152,789       0
Shares subject to possible redemption 7,182,567 14,309,217        
Number of shares of common stock each holder receive 0.10          
Common Stock | Independent Directors            
Class Of Stock [Line Items]            
Common stock issued in consideration of future services, shares 60,000 60,000        
Preferred Stock            
Class Of Stock [Line Items]            
Preferred stock, shares authorized 1,000,000          
Preferred stock, shares issued 0 0        
Preferred stock, shares outstanding 0 0        
Warrants            
Class Of Stock [Line Items]            
Exercise price of warrants $ 11.50       $ 11.50  
Number of shares of common stock each holder receive 4       0.75  
Warrant agreement date Dec. 12, 2017          
Number of fractional shares issued upon exercise of warrants 0          
Period after business combination when warrants become exercisable 30 days          
Period after offering when warrants become exercisable 12 months          
Warrants exercisable expiration period after completion of business combination 5 years          
Net cash settlement value of warrants $ 0          
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          
Warrants or rights outstanding 11,154,942 11,154,942        
Warrants | Minimum            
Class Of Stock [Line Items]            
Period allotted to complete the business combination 18 months          
Warrants | Maximum            
Class Of Stock [Line Items]            
Period allotted to complete the business combination 24 months