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Fair Value Measurements - Additional Information (Detail) - USD ($) | 6 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017
Fair Value Disclosures [Abstract] |  |
Fair Value Measurements, Inter-transfers between Levels | $ 0 | $ 0

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- Definition Fair value measurements inter transfers between levels. + References No definition available. + Details
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- References No definition available. + Details
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