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Business Description, Basis of Presentation and Significant Accounting Policies - Rollforward Allowance for Doubtful Accounts (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Allowance for Doubtful Accounts Receivable [Roll Forward]    
Balance at beginning of the year $ 60 $ 149
Charged to costs and expenses 96 25
Write offs, net of recoveries (27) (114)
Balance at end of the year $ 129 $ 60