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Accounts Payable and Accrued Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Payables and Accruals [Abstract]    
Accrued employee related costs $ 24,901 $ 9,559
Accounts payable 5,648 5,085
Accrued development costs 4,799 5,543
Other accrued liabilities 18,172 5,995
Accounts payable and accrued liabilities $ 53,520 $ 26,182