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Marketable Securities (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items] |  |
Marketable Securities, Interest Income | $ 0 | $ 110
Amortized Cost | 22,618,000 | 24,509,000
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 1,000 | 7,000
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 0 | (3,000)
Fair Value | 22,619,000 | 24,513,000
Debt Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 9,374,000 | 17,685,000
Fair Value | 9,375,000 | 17,689,000
Money market mutual funds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 13,244,000 | 6,824,000
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 0 | 0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 0 | 0
Fair Value | 13,244,000 | 6,824,000
Government agency bonds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost |  | 3,505,000
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax |  | 0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  | (3,000)
Fair Value |  | 3,502,000
United States treasuries |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 1,002,000 | 4,002,000
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 0 | 4,000
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 0 | 0
Fair Value | 1,002,000 | 4,006,000
Corporate notes |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 2,283,000 | 4,665,000
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 1,000 | 2,000
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 0 | 0
Fair Value | 2,284,000 | 4,667,000
Certificates of deposit |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 6,089,000 | 4,155,000
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 0 | 0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 0 | 0
Fair Value | $ 6,089,000 | 4,155,000
Municipal Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost |  | 1,358,000
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax |  | 1,000
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  | 0
Fair Value |  | $ 1,359,000

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- Definition This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + 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 (aa) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + 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=65884222&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=73527792&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=66010992&loc=d3e26610-111562 + Details
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- Definition This item represents the total realized gain (loss) included in earnings for the period as a result of selling marketable securities categorized as trading, available-for-sale, or held-to-maturity. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7(c)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27357-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27405-111563 + Details
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