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v3.19.2

Summary of Significant Accounting Policies (Details 6) | 6 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018
Swedish Krona [Member] |  |
Weighted-average exchange rate for the condensed consolidated statements of operations |  |
Weighted-average exchange rate for statements of operations | 9.31 | 8.38
Japanese Yen [Member] |  |
Weighted-average exchange rate for the condensed consolidated statements of operations |  |
Weighted-average exchange rate for statements of operations | 110.03 | 108.71
South Korean Won [Member] |  |
Weighted-average exchange rate for the condensed consolidated statements of operations |  |
Weighted-average exchange rate for statements of operations | 1,146.39 | 1,074.69
Taiwan Dollar [Member] |  |
Weighted-average exchange rate for the condensed consolidated statements of operations |  |
Weighted-average exchange rate for statements of operations | 30.97 | 29.52

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