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Share-Based Payments - Summary of Change in Number of BSA 2 Outstanding (Detail)
 12 Months Ended
Dec. 31, 2017
Dec. 15, 2017
Dec. 05, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Granted during the period   8,300 625,200    
BSA 2 [Member]          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Balance at beginning of period 0     0 8,049
Granted during the period 0     0 0
Forfeited during the period 0     0 0
Exercised during the period         8,049
Expired during the period 0     0 0
Balance at end of period 0     0 0