Quarterly report pursuant to Section 13 or 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
Mar. 31, 2018
Dec. 31, 2017
Payables and Accruals [Abstract]    
Project development activities $ 4,385 $ 5,142
Payroll and compensation 10,768 25,833
Accrued taxes 2,969 2,764
Professional services (e.g., legal, audit) 2,671 2,806
Other 3,095 2,556
Total accrued liabilities $ 23,888 $ 39,101