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Financial Instruments - Additional Information (Detail) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2017 | Dec. 31, 2016 | Jun. 30, 2016 | Dec. 31, 2015
Fair Value Of Financial Instruments [Line Items] |  |  |  |
Fair value of note payable | $ 5,300 | $ 5,300 |  |
Cash and cash equivalents | 27,166 | 45,824 | $ 56,606 | $ 34,194
Cash held outside United States, principally in Netherlands, United Kingdom, China, and Canada | 15,000 | 25,600 |  |
Credit Agreement [Member] |  |  |  |
Fair Value Of Financial Instruments [Line Items] |  |  |  |
Fair value of debt issued | $ 117,400 | $ 125,100 |  |

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