Annual report pursuant to section 13 and 15(d)

Allowance for Bad Debts (Detail)

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Allowance for Bad Debts (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Allowance for doubtful accounts at January 1, $ 57 $ 53 $ 36
Additions 170 17 19
Write-offs (17) (13) (2)
Allowance for doubtful accounts at December 31, $ 210 $ 57 $ 53