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Summary of Significant Accounting Policies - Trade Receivables - Rollforward of Allowance for Doubtful Accounts (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Allowance for Doubtful Accounts Receivable [Roll Forward]    
Beginning balance $ 565us-gaap_AllowanceForDoubtfulAccountsReceivable  
Charged to operating expenses 393us-gaap_ProvisionForDoubtfulAccounts 0us-gaap_ProvisionForDoubtfulAccounts
Write offs of accounts receivable (87)us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs  
Ending balance $ 871us-gaap_AllowanceForDoubtfulAccountsReceivable