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Profit Appropriation and Restricted Net Assets (Details) $ in Millions	12 Months Ended
	Dec. 31, 2016 USD ($) fund	Dec. 31, 2015 USD ($)
Profit Appropriation and Restricted Net Assets
Minimum percentage of after-tax profit transferred by Chinese subsidiaries to general reserve fund	10.00%
Maximum percentage criteria for appropriation of after-tax profit of Chinese subsidiaries to general reserve fund	50.00%
Number of reserve funds except general reserve fund, appropriation at the entity's discretion | fund	2
Minimum percentage of after-tax profit transferred by VIEs to statutory reserve fund	10.00%
Maximum percentage criteria for in appropriation of after-tax profit by VIEs to certain statutory reserve funds	50.00%
Reserves made to non-distributable reserve fund (in dollars)	$ 28.0	$ 7.1
Net assets subject to restriction for the Group (in dollars)	$ 231.5
Percent of restricted net assets of total consolidated net assets	31.00%

X

- Definition

Amount of restricted net assets of consolidated and unconsolidated subsidiaries as of the end of the most recently completed fiscal year.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(e)(3)(ii))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

+ Details

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X

- Definition

Represents the amount transferred to certain statutory reserve funds as of balance sheet date.

+ References

No definition available.

+ Details

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X

- Definition

Represents the maximum percentage criteria expressed as a percentage of registered capital for the transfer of after-tax profit by subsidiaries in China to a general reserve fund. If the reserve fund exceeds the specified threshold of the registered capital, further appropriation is not required.

+ References

No definition available.

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X

- Definition

Represents the maximum percentage criteria expressed as a percentage of registered capital for the transfer of after-tax profit by VIEs in China to statutory reserve funds. If the statutory reserve fund exceeds the specified threshold of the registered capital, further appropriation is not required.

+ References

No definition available.

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X

- Definition

Represents the minimum percentage of after-tax profit transferred by Chinese subsidiaries to general reserve fund.

+ References

No definition available.

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X

- Definition

Represents the minimum percentage of after-tax profit transferred by VIEs to statutory reserve fund.

+ References

No definition available.

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- Definition

Represents the number of reserve funds except general reserve fund, appropriation of which is at the entity's discretion.

+ References

No definition available.

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- References

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- Definition

The percent of restricted net assets of the aggregate value of consolidated net assets.

+ References

No definition available.

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