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Accounts Payable and Accrued Liabilities - Accounts Payable and Accrued Liabilities (Detail) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2018 | Dec. 31, 2017
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Payables And Accruals [Abstract] |  |  |  |
Trade and accrued payables | $ 3,729 | $ 4,727 |  |
Accrued wages and commissions | 477 | 1,396 |  |
Customer deposits | 2,357 | 1,189 |  |
Warranty | 186 | 195 | $ 227 | $ 258
Other | 54 | 107 |  |
Accounts Payable and other accrued liabilities | $ 6,803 | $ 7,614 |  |

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