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Significant Accounting Policies - Estimated Useful Lives of Property and Equipment (Detail)
12 Months Ended
Dec. 31, 2014
Computer Equipment and Purchased Software [Member]  
Property, Plant and Equipment [Line Items]  
Useful life of property and equipment 3 years
Furniture and Fixtures [Member]  
Property, Plant and Equipment [Line Items]  
Useful life of property and equipment 5 years
Minimum [Member] | Machinery and Equipment [Member]  
Property, Plant and Equipment [Line Items]  
Useful life of property and equipment 3 years
Maximum [Member] | Machinery and Equipment [Member]  
Property, Plant and Equipment [Line Items]  
Useful life of property and equipment 5 years