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Commitments and Contingencies (Details) $ in Millions, ₩ in Billions | Jun. 30, 2017 USD ($) | Jun. 30, 2017 KRW (₩) | Dec. 31, 2016 USD ($) | Dec. 31, 2016 KRW (₩)
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Assessment |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Estimate of possible loss |  |  | $ 10.2 | ₩ 11.9
Additional Assessment |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Estimate of possible loss | $ 17.9 | ₩ 20.1 |  |

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