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Commitments and Contingencies - Operating Leases - Additional Information (Detail)
3 Months Ended
Mar. 31, 2018
ft²
Operating Lease One [Member]  
Commitments And Contingencies [Line Items]  
Office space rent under operating lease 54,943
Lease expire date Aug. 15, 2024
Operating Lease Two [Member]  
Commitments And Contingencies [Line Items]  
Office space rent under operating lease 19,805
Lease expire date Feb. 28, 2022