Annual report pursuant to Section 13 and 15(d)

Accounts Payable and Accrued Liabilities - Schedule of Components of Accounts Payable and Accrued Liabilities (Detail)

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Accounts Payable and Accrued Liabilities - Schedule of Components of Accounts Payable and Accrued Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Payables and Accruals [Abstract]    
Project development activities $ 14,870 $ 12,549
Payroll and compensation 25,833 6,311
Accrued taxes 2,764 0
Professional services (e.g., legal, audit) 3,696 2,323
Contingency loss 0 2,560
Other 3,400 660
Total accounts payable and accrued liabilities $ 50,563 $ 24,403