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Commitments and Contingencies - Operating Leases - Additional Information (Detail) - ft²
1 Months Ended
Jan. 01, 2018
Aug. 15, 2017
May 31, 2017
May 31, 2017
May 31, 2016
Operating Lease One [Member]          
Commitments And Contingencies [Line Items]          
Office space rent under operating lease       22,067 19,805
Lease expire date       Feb. 28, 2022 Feb. 28, 2022
Lease existence of option to extend     true    
Commencement date of lease         Sep. 30, 2016
Sixth Amendment to Lease [Member]          
Commitments And Contingencies [Line Items]          
Lease expire date     Aug. 15, 2024    
Increased office space rent   8,200 32,876    
Sixth Amendment to Lease [Member] | Scenario Forecast [Member]          
Commitments And Contingencies [Line Items]          
Increased office space rent 24,676