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Property and Equipment, Net - Depreciation of Property and Equipment (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Total depreciation and amortization	$ 366us-gaap_DepreciationDepletionAndAmortization	$ 182us-gaap_DepreciationDepletionAndAmortization
Cost of Revenues [Member]
Property, Plant and Equipment [Line Items]
Total depreciation and amortization	348us-gaap_DepreciationDepletionAndAmortization / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember	180us-gaap_DepreciationDepletionAndAmortization / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember
Sales and Marketing Expense [Member]
Property, Plant and Equipment [Line Items]
Total depreciation and amortization	4us-gaap_DepreciationDepletionAndAmortization / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingAndMarketingExpenseMember	1us-gaap_DepreciationDepletionAndAmortization / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingAndMarketingExpenseMember
General and Administrative Expense [Member]
Property, Plant and Equipment [Line Items]
Total depreciation and amortization	$ 14us-gaap_DepreciationDepletionAndAmortization / us-gaap_IncomeStatementLocationAxis = us-gaap_GeneralAndAdministrativeExpenseMember	$ 1us-gaap_DepreciationDepletionAndAmortization / us-gaap_IncomeStatementLocationAxis = us-gaap_GeneralAndAdministrativeExpenseMember

X

- Definition

The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

+ Details

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