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Taxes (Details) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax Disclosure [Abstract] |  |  |  |
China Statutory income tax rate |  | 25.00% | 25.00% | 25.00%
Effect of favorable income tax rate in certain entity in PRC |  | (1.40%) | (2.80%) | (3.00%)
Non-PRC entities not subject to PRC tax | [1] | 6.30% | 4.50% | 3.00%
Research & Development ("R&D") tax credit | [2] | (1.10%) | (0.30%) | (0.50%)
Non-deductible expenses-permanent difference | [3] | 0.20% | 0.00% | 1.10%
Change in valuation allowance |  | (3.30%) | 2.90% | 4.60%
Effective tax rate |  | 25.70% | 29.30% | 30.20%
[1] | Represents the tax losses incurred from operations outside of China.
[2] | According to PRC tax regulations, 150% of current year R&D expense approved by the local tax authority may be deducted from tax income.
[3] | Represents expenses incurred by the Company that were not deductible for PRC income tax.

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