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Marketable Securities (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | $ 25,299 us-gaap_AvailableForSaleSecuritiesAmortizedCost | $ 26,096 us-gaap_AvailableForSaleSecuritiesAmortizedCost
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 198 us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax | 117 us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
Gross unrealized holding losses | (50)us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax | (57)us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
Estimated fair value | 25,447 us-gaap_AvailableForSaleSecurities | 26,156 us-gaap_AvailableForSaleSecurities
Corporate Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 19,220 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_DebtSecurityAxis = us-gaap_CorporateDebtSecuritiesMember |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 162 us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_DebtSecurityAxis = us-gaap_CorporateDebtSecuritiesMember |
Gross unrealized holding losses | (48)us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_DebtSecurityAxis = us-gaap_CorporateDebtSecuritiesMember |
Estimated fair value | 19,334 us-gaap_AvailableForSaleSecurities / us-gaap_DebtSecurityAxis = us-gaap_CorporateDebtSecuritiesMember |
Municipal Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 6,079 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_DebtSecurityAxis = us-gaap_MunicipalBondsMember |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 36 us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_DebtSecurityAxis = us-gaap_MunicipalBondsMember |
Gross unrealized holding losses | (2)us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_DebtSecurityAxis = us-gaap_MunicipalBondsMember |
Estimated fair value | $ 6,113 us-gaap_AvailableForSaleSecurities / us-gaap_DebtSecurityAxis = us-gaap_MunicipalBondsMember |

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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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- Definition Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=51813488&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49167202&loc=d3e26610-111562 + Details
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