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Summary of Operations and Significant Accounting Policies - 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
Receivables [Abstract]      
Allowance for doubtful accounts, beginning balance $ 381 $ 452 $ 374
Charges to expense 300 195 100
Write-offs of uncollectible accounts, net of recoveries (439) (266) (22)
Allowance for doubtful accounts, ending balance $ 242 $ 381 $ 452