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Other Income (Expense), Net - Components of Other Income (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Other Income and Expenses [Abstract]      
Rental income $ 462    
Foreign currency losses, net (268) $ (161) $ (196)
Interest income 68 47 80
Credit gains on available for sale securities 13 12 311
(Loss) gain on disposal of equipment (4) 60 22
Other 13 67 51
Total other income (expense), net $ 284 $ 25 $ 268