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Income Taxes - Other Narrative (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Taxes [Line Items] |  |  |
Provision for undistributed earnings of our foreign subsidiaries | $ 0 |  |
State Administration of Taxation, China |  |  |
Income Taxes [Line Items] |  |  |
Period of recognition for deductible expenses or deferred tax assets | 5 years |  |
Increase in income tax expense due to write-off of deferred tax assets for social insurance and housing funds | $ 0 | $ 0 | $ 600,000

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- Definition Income Tax Expense (Benefit), Provision for Undistributed Foreign Earnings + References No definition available. + Details
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- Definition Increase In Income Tax Expense due to Write-Off Deferred Tax Assets for Social Insurance and Housing Funds + References No definition available. + Details
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- Details
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