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Summary of Significant Accounting Policies (Details 7) | 6 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017
Swedish Krona [Member] |  |
Weighted-average exchange rate for the condensed consolidated statements of operations |  |
Weighted-average exchange rate for statements of operations | 8.38 | 8.87
Japanese Yen [Member] |  |
Weighted-average exchange rate for the condensed consolidated statements of operations |  |
Weighted-average exchange rate for statements of operations | 108.71 | 112.41
South Korean Won [Member] |  |
Weighted-average exchange rate for the condensed consolidated statements of operations |  |
Weighted-average exchange rate for statements of operations | 1,074.69 | 1,138.83
Taiwan Dollar [Member] |  |
Weighted-average exchange rate for the condensed consolidated statements of operations |  |
Weighted-average exchange rate for statements of operations | 29.52 | 30.64

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