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Marketable Securities - Schedule of Available-for-sale Securities (Details) $ in Thousands | Dec. 31, 2016 USD ($)
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Less than 12 Months - Estimated Fair Value | $ 14,204
Less than 12 Months - Gross Unrealized Holding Losses | (157)
More than 12 Months - Estimated Fair Value | 1,029
More than 12 Months - Gross Unrealized Holding Losses | (9)
Total Estimated Fair Value | 15,233
Total Gross Unrealized Holding Losses | (166)
Corporate Bonds and Notes [Member] |
Less than 12 Months - Estimated Fair Value | 10,294
Less than 12 Months - Gross Unrealized Holding Losses | (112)
More than 12 Months - Estimated Fair Value | 1,029
More than 12 Months - Gross Unrealized Holding Losses | (9)
Total Estimated Fair Value | 11,323
Total Gross Unrealized Holding Losses | (121)
Municipal Bonds [Member] |
Less than 12 Months - Estimated Fair Value | 3,910
Less than 12 Months - Gross Unrealized Holding Losses | (45)
More than 12 Months - Estimated Fair Value |
More than 12 Months - Gross Unrealized Holding Losses |
Total Estimated Fair Value | 3,910
Total Gross Unrealized Holding Losses | $ (45)

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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27337-111563 + Details
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