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Accounts Payable and Accrued Liabilities - Accounts Payable and Accrued Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Payables and Accruals [Abstract]      
Trade and accrued payables $ 8,279 $ 6,925  
Warranty 258 287 $ 312
Customer deposits 575 497  
Other 4 12  
Accounts Payable and Accrued Liabilities $ 9,116 $ 7,721