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Trade Accounts Receivable, Net (Detail) (USD $)
In Thousands, unless otherwise specified
6 Months Ended 12 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Receivables [Abstract]    
Trade accounts receivable $ 5,150 $ 3,803
Sales returns and allowances (211) (161)
Trade and other accounts receivable, gross 4,939 3,642
Allowance for uncollectible accounts (35) (35)
Trade accounts receivable, net $ 4,904 $ 3,607