Quarterly report pursuant to Section 13 or 15(d)

Debt - Summary of Notes Payable (Detail)

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Debt - Summary of Notes Payable (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Total, Notes payable   $ 740
Notes Payable    
Debt Instrument [Line Items]    
Principal on fixed rate notes, interest rate 5.00% 5.00%
Principal on fixed rate notes, amount   $ 722
Interest payable   $ 18