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
Jun. 30, 2017
Dec. 31, 2016
Payables and Accruals [Abstract]    
Front-end engineering and design $ 776 $ 12,549
Payroll and compensation 10,507 6,311
Professional services (e.g., legal, audit) 2,736 2,323
Other 4,851 3,220
Total accounts payable and accrued liabilities $ 18,870 $ 24,403