Annual report pursuant to Section 13 and 15(d)

Accounts Payable, Accrued and Other Liabilities - Components of Accounts Payable, Accrued and Other Liabilities (Detail)

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Accounts Payable, Accrued and Other Liabilities - Components of Accounts Payable, Accrued and Other Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Payables And Accruals [Abstract]    
Line of credit $ 12,500  
Accounts payable 2,283 $ 2,054
Accrued compensation 1,127 844
Accrued expenses 938 3,774
Accounts payable and accrued liabilities $ 16,848 $ 6,672