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Accounts Payable and Accrued Liabilities - Accounts Payable and Accrued Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
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Payables And Accruals [Abstract] |  |  |
Trade and accrued payables | $ 4,727 | $ 8,240 |
Accrued wages and commissions | 1,396 | 39 |
Customer Deposits | 1,189 | 575 |
Warranty | 195 | 258 | $ 287
Other | 107 | 4 |
Accounts Payable and other accrued liabilities | $ 7,614 | $ 9,116 |

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