Quarterly report pursuant to Section 13 or 15(d)

Intangible Assets and Goodwill - Additional Information (Detail)

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Intangible Assets and Goodwill - Additional Information (Detail) (USD $)
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Intangible Assets And Goodwill [Line Items]    
Amortization expense $ 46,000 $ 33,000