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Nature of Operations and Summary of Significant Accounting Policies - Narrative (Details) ¥ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2017 USD ($) | Dec. 31, 2017 USD ($) installment | Dec. 31, 2016 USD ($) installment | Dec. 31, 2015 USD ($) | Jun. 30, 2015 CNY (¥)
Property, Plant and Equipment [Line Items] |  |  |  |  |
Restricted cash | $ |  | $ 3,100,000 |  |  |
Loss on foreign exchange | $ | $ (451,000) |  | $ (333,000) | $ (204,000) |
Long-Term Incentive Plan, Payment Commencing in February of the Calendar Year Immediately Following the Conclusion of the Performance Period |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Long-term incentive plan, percentage of award payable in cash |  | 50.00% |  |  |
Long-term incentive plan, number of installments | installment |  | 35 |  |  |
Long-Term Incentive Plan, Payment Commencing in February 2021 and Ending in December 2023 |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Long-term incentive plan, percentage of award payable in cash |  |  | 50.00% |  |
Long-term incentive plan, number of installments | installment |  |  | 35 |  |
Software and Software Development Costs [Member] | Minimum |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Property, and equipment useful life |  | 3 years |  |  |
Software and Software Development Costs [Member] | Maximum |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Property, and equipment useful life | 5 years |  |  |  |
Furniture and Fixtures | Minimum |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Property, and equipment useful life |  | 5 years |  |  |
Furniture and Fixtures | Maximum |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Property, and equipment useful life |  | 7 years |  |  |
China |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Restricted cash | ¥ |  |  |  |  | ¥ 20

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