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Marketable Securities (Fair Value to Amortized Cost) (Details) $ in Thousands | Sep. 30, 2018 USD ($)
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Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale securities, amortized cost basis | $ 4,756 | [1]
Available-for-sale securities, unrealized gains | 0 |
Available-for-sale securities, unrealized losses | (20) |
Available-for-sale marketable securities, fair value | 4,736 | [1]
Purchased and accrued interest | 6 |
Current Assets | Certificates of deposit |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale securities, amortized cost basis | 4,756 | [1]
Available-for-sale securities, unrealized gains | 0 |
Available-for-sale securities, unrealized losses | (20) |
Available-for-sale marketable securities, fair value | $ 4,736 | [1]
[1] | Included in amortized cost and fair value is purchased and accrued interest of $6

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563 + Details
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- Definition Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563 + Details
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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118942338&loc=SL82898722-210454 + Details
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