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Components of Accounts Receivable, Net of Allowance (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Components of accounts receivable, net of allowances    
Trade $ 10,960 $ 11,456
Royalties 82 45
Other 85 179
Total receivables, net $ 11,127 $ 11,680