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Interim Consolidated Financial Statements - Summary of Effect of Adopting ASC 606 In Consolidated Statement of Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Net loss | $ (1,733) | $ 3,030
Comprehensive income (loss) | (145) | $ 3,837
ASC 606 [Member] | Amounts as if Previous Guidance in Effect [Member] |  |
Net loss | (209) |
Comprehensive income (loss) | $ 1,379 |

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