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Certain Balance Sheet Accounts - Summary of Allowance for Doubtful Accounts (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Statement Of Financial Position [Abstract]      
Balance, beginning of year $ 404 $ 326 $ 407
Provision for doubtful accounts 189 708 233
Write-offs (339) (630) (314)
Balance, end of year $ 254 $ 404 $ 326