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Property and Equipment Estimated Useful Lives (Detail)
12 Months Ended
Dec. 31, 2012
Equipment | Minimum
 
Property, Plant and Equipment [Line Items]  
Property plant and equipment useful life 3 years
Equipment | Maximum
 
Property, Plant and Equipment [Line Items]  
Property plant and equipment useful life 7 years
Furniture and Fixtures
 
Property, Plant and Equipment [Line Items]  
Property plant and equipment useful life 7 years
Software
 
Property, Plant and Equipment [Line Items]  
Property plant and equipment useful life 3 years
Leasehold Improvements
 
Property, Plant and Equipment [Line Items]  
Property plant and equipment useful life Lesser of lease term or life of improvements