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Other Income (Expense), Net - Components of Other Income (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Other Income and Expenses [Abstract]      
Rental income $ 792 $ 462  
Foreign currency gains (losses), net 323 (268) $ (161)
Interest income 124 68 47
Gain (loss) on disposal of equipment 14 (4) 60
Credit gains on available-for-sale securities 11 13 12
Other (2) 13 67
Total other income (expense), net $ 1,262 $ 284 $ 25