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Business Description, Basis of Presentation and Significant Accounting Policies - Rollforward Allowance for Doubtful Accounts (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Allowance for Doubtful Accounts Receivable [Roll Forward]    
Balance at beginning of the year $ 129 $ 60
Allowance increase (decrease) (49) 96
Write offs, net of recoveries (22) (27)
Balance at end of the year $ 58 $ 129