Quarterly report pursuant to Section 13 or 15(d)

Initial Public Offering - Additional Information (Detail)

v3.10.0.1
Initial Public Offering - Additional Information (Detail)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
May 24, 2018
USD ($)
$ / shares
shares
May 08, 2018
USD ($)
$ / shares
shares
Apr. 23, 2018
$ / shares
shares
Jun. 30, 2018
USD ($)
$ / shares
shares
Jun. 30, 2018
USD ($)
$ / shares
shares
Sep. 30, 2017
USD ($)
$ / shares
shares
Initial Public Offering [Line Items]            
Common stock split conversion ratio     25.2      
Stockholders equity note, stock split     All share and per share amounts have been retroactively adjusted for all periods presented to give effect to the 25.2 to 1 split of the common stock as part of the Reclassification (the "Stock Split")      
Share price | $ / shares $ 12.00          
Proceeds from issuance initial public offering | $         $ 98,009  
Other Current Assets [Member]            
Initial Public Offering [Line Items]            
Offering Cost reflected as capitalized equity issuance costs | $           $ 2,200
Additional Paid-in Capital [Member]            
Initial Public Offering [Line Items]            
Common stock shares issued         98,000  
issuance costs reclassified to additional paid-in capital | $       $ 6,300    
Class Aand Class B Common Stock [Member]            
Initial Public Offering [Line Items]            
Common stock par value | $ / shares     $ 0.001      
Class B Common Stock [Member]            
Initial Public Offering [Line Items]            
Common stock par value | $ / shares       $ 0.001 $ 0.001 $ 0.001
Conversion rate to reclassify common stock to class B shares     25.2      
Conversion of Common stock B into shares of common stock A 350,000 2,250,000 41,817,537      
Common stock shares authorized     100,000,000 100,000,000 100,000,000 0
Common stock shares issued 42,387,571 42,737,571   42,387,571 42,387,571 0
Common stock shares outstanding 39,217,537 39,567,537   39,464,619 39,464,619 0
Class A Common Stock [Member]            
Initial Public Offering [Line Items]            
Common stock par value | $ / shares       $ 0.001 $ 0.001 $ 0.001
Common stock shares authorized     400,000,000 400,000,000 400,000,000 0
Common stock shares issued 700,000 11,250,000     9,350,000  
Share price | $ / shares   $ 12.00        
Common stock shares issued       11,950,000 11,950,000 0
Common stock shares outstanding       11,950,000 11,950,000 0
Class A Common Stock [Member] | Directly Sold by The Company [Member]            
Initial Public Offering [Line Items]            
Common stock shares issued 350,000 9,000,000        
Proceeds from issuance initial public offering | $ $ 3,900 $ 100,400        
Underwriting discounts and commissions | $ $ 300 7,600        
Estimated offering expenses | $   $ 6,300        
Class A Common Stock [Member] | Common ClassB Shareholders [Member]            
Initial Public Offering [Line Items]            
Common stock shares issued 350,000 2,250,000        
Treasury Shares Class B [Member]            
Initial Public Offering [Line Items]            
Conversion of Common stock B into shares of common stock A     3,170,034