Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Additional Information (Details)

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Summary of Significant Accounting Policies - Additional Information (Details) - USD ($)
3 Months Ended
Dec. 31, 2018
Jan. 09, 2018
Dec. 31, 2017
Dec. 31, 2018
Sep. 30, 2018
Dec. 12, 2017
Schedule Of Significant Accounting Policies [Line Items]            
Cash $ 324,300     $ 324,300 $ 597,268  
Working capital deficit $ 1,034,524     1,034,524    
Offering costs charged to stockholders' equity upon completion of offering       $ 3,252,059    
Number of shares of common stock underlying restricted stock award subject to forfeiture 60,000   65,000      
Sale of stock price per unit $ 10.00     $ 10.00   $ 10.00
Unrecognized tax benefits $ 0     $ 0 0  
Amount accrued for payment of interest and penalties 0     0 $ 0  
Offering and Private Placement | Warrants            
Schedule Of Significant Accounting Policies [Line Items]            
Warrants sold to purchase common stock $ 11,154,942   $ 9,742,125 $ 11,154,942    
Offering and Private Placement | Rights            
Schedule Of Significant Accounting Policies [Line Items]            
Rights sold for conversion into common stock 1,487,326   1,298,950      
Over-Allotment Option            
Schedule Of Significant Accounting Policies [Line Items]            
Number of additional units purchased by underwriters   1,875,000 1,875,000      
Sale of stock price per unit   $ 10.00 $ 10.00