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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, 2013
Dec. 31, 2012
Dec. 31, 2011
Property, Plant and Equipment [Line Items]      
Total depreciation and amortization $ 182 $ 133 $ 385
Cost of Revenues [Member]
     
Property, Plant and Equipment [Line Items]      
Total depreciation and amortization 180      
Sales and Marketing Expense [Member]
     
Property, Plant and Equipment [Line Items]      
Total depreciation and amortization 1      
General and Administrative Expense [Member]
     
Property, Plant and Equipment [Line Items]      
Total depreciation and amortization $ 1