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Summary of Significant Accounting Policies (Details 4) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Swedish Krona [Member] |  |  |
Weighted average exchange rate for consolidated statements of operations |  |  |
Weighted-average exchange rate for consolidated statements of operations | 8.54 | 8.55 | 8.43
Japanese Yen [Member] |  |  |
Weighted average exchange rate for consolidated statements of operations |  |  |
Weighted-average exchange rate for consolidated statements of operations | 112.15 | 108.75 | 121.03
South Korean Won [Member] |  |  |
Weighted average exchange rate for consolidated statements of operations |  |  |
Weighted-average exchange rate for consolidated statements of operations | 1,128.65 | 1,157.14 | 1,130.22
Taiwan Dollar [Member] |  |  |
Weighted average exchange rate for consolidated statements of operations |  |  |
Weighted-average exchange rate for consolidated statements of operations | 30.41 | 32.22 | 31.73

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