Annual report pursuant to Section 13 and 15(d)

Debt - Summary of Future Principal Amounts Payable (Detail)

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Debt - Summary of Future Principal Amounts Payable (Detail)
$ in Thousands
Dec. 31, 2016
USD ($)
Debt Disclosure [Abstract]  
Future principal amounts payable, 2017 $ 1,711
Future principal amounts payable, 2018 722
Future principal amounts payable, Total $ 2,433