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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, 2014
Dec. 31, 2013
Allowance for Doubtful Accounts Receivable [Roll Forward]    
Balance at beginning of the year $ 129us-gaap_AllowanceForDoubtfulAccountsReceivable $ 60us-gaap_AllowanceForDoubtfulAccountsReceivable
Allowance increase (decrease) (49)us-gaap_AllowanceForDoubtfulAccountsReceivablePeriodIncreaseDecrease 96us-gaap_AllowanceForDoubtfulAccountsReceivablePeriodIncreaseDecrease
Write offs, net of recoveries (22)us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs (27)us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs
Balance at end of the year $ 58us-gaap_AllowanceForDoubtfulAccountsReceivable $ 129us-gaap_AllowanceForDoubtfulAccountsReceivable