Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Additional Information (Details)

v3.19.2
Stockholders' Equity - Additional Information (Details) - USD ($)
9 Months Ended 12 Months Ended
Jun. 30, 2019
Sep. 30, 2018
Jun. 05, 2019
Mar. 31, 2019
Jun. 30, 2018
Mar. 31, 2018
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 4,397,901 4,152,789 11,636,542          
Common stock, shares outstanding 4,397,901 4,152,789 11,636,542          
Preferred stock, shares authorized 1,000,000 1,000,000            
Preferred stock, shares issued 0 0            
Preferred stock, shares outstanding 0 0            
Rights                
Class Of Stock [Line Items]                
Number of shares of common stock each holder receive             0.10  
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              
Minimum | Rights                
Class Of Stock [Line Items]                
Period allotted to complete the business combination 18 months              
Maximum | Rights                
Class Of Stock [Line Items]                
Period allotted to complete the business combination 24 months              
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 4,397,901 4,152,789            
Common stock, shares outstanding 4,397,901 4,152,789   4,193,926 4,093,245 4,103,645   0
Shares subject to possible redemption 7,238,641 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              
Preferred stock, shares outstanding 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