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Balance Sheets (Allowance for Doubtful Accounts Receivable) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Allowance for Doubtful Accounts Receivable [Roll Forward]      
Allowance - beginning of period $ (460)us-gaap_AllowanceForDoubtfulAccountsReceivable $ (150)us-gaap_AllowanceForDoubtfulAccountsReceivable $ (17)us-gaap_AllowanceForDoubtfulAccountsReceivable
Provisions for doubtful accounts (11)us-gaap_ProvisionForDoubtfulAccounts (386)us-gaap_ProvisionForDoubtfulAccounts (133)us-gaap_ProvisionForDoubtfulAccounts
Recoveries from bad debts 0us-gaap_AllowanceForDoubtfulAccountsReceivableRecoveries 76us-gaap_AllowanceForDoubtfulAccountsReceivableRecoveries 0us-gaap_AllowanceForDoubtfulAccountsReceivableRecoveries
Write-off and other 43us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs 0us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs 0us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs
Allowance - end of period $ (428)us-gaap_AllowanceForDoubtfulAccountsReceivable $ (460)us-gaap_AllowanceForDoubtfulAccountsReceivable $ (150)us-gaap_AllowanceForDoubtfulAccountsReceivable