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Basis of Presentation and Summary Accounting Policies - Additional Information (Detail) (USD $)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Dec. 31, 2010
Schedule Of Significant Accounting Policies [Line Items]            
Percentage of total annual net sales in the third and fourth quarters         59.00% 60.00%
Shipping and handling revenue $ 234,000 $ 274,000 $ 587,000 $ 729,000