Accounts Payable and Accrued Liabilities - Accounts Payable and Accrued Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Payables and Accruals [Abstract]
Trade and accrued payables	$ 6,925	$ 6,720
Warranty	287	312	$ 492
Customer deposits	497	591
Other	12	15
Accounts Payable and Accrued Liabilities	$ 7,721	$ 7,638