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Commitments and Contingencies - Operating Leases - Additional Information (Detail) - ft²
1 Months Ended 3 Months Ended
May 31, 2016
Mar. 31, 2017
Operating Lease One [Member]    
Commitments And Contingencies [Line Items]    
Office space rent under operating lease   22,067
Lease expire date   Feb. 28, 2022
Operating Lease Two [Member]    
Commitments And Contingencies [Line Items]    
Office space rent under operating lease 19,805  
Lease expire date Feb. 28, 2022  
Commencement date of lease Sep. 30, 2016