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Summary of Significant Accounting Policies (Details 7) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Swedish Krona [Member] |  |
Weighted average exchange rate for consolidated statements of operations |  |
weighted-average exchange rate | 8.70 | 8.54
Japanese Yen [Member] |  |
Weighted average exchange rate for consolidated statements of operations |  |
weighted-average exchange rate | 110.43 | 112.15
South Korean Won [Member] |  |
Weighted average exchange rate for consolidated statements of operations |  |
weighted-average exchange rate | 1,100.50 | 1,128.65
Taiwan Dollar [Member] |  |
Weighted average exchange rate for consolidated statements of operations |  |
weighted-average exchange rate | 30.15 | 30.41

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