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Quarterly Results of Operations (unaudited) - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended
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Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |
Revision of previously issued financial statements, resulted decrease in gross profit and increase in operating expenses | $ 2,051 | $ 1,974 | $ 1,824 | $ 648 | $ 571 | $ 759 | $ 568

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