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The Company and Basis of Presentation - Additional Information (Detail) (USD $)
3 Months Ended
Mar. 31, 2013
Markets
Dec. 31, 2012
Mar. 31, 2012
Dec. 31, 2011
Statement Of Financial Position [Abstract]        
Number of market for products 50      
Cash and cash equivalents $ 19,293,000 $ 22,241,000 $ 16,859,000 $ 20,666,000
Anticipated cash flow from operations and other working capital $ 44,400,000