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Marketable Securities - Available-for-sale Marketable Securities in Gross Unrealized Loss Position (Details) $ in Thousands | Sep. 30, 2020 USD ($)
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Marketable Securities [Line Items] |
Estimated fair value, less than 12 months | $ 192
Gross unrealized holding losses, less than 12 months | 5
Estimated fair value, more than 12 months |
Gross unrealized holding losses, more than 12 months |
Estimated fair value | 192
Gross unrealized holding losses | 5
Corporate bonds and notes [Member] |
Marketable Securities [Line Items] |
Estimated fair value, less than 12 months | 192
Gross unrealized holding losses, less than 12 months | 5
Estimated fair value, more than 12 months |
Gross unrealized holding losses, more than 12 months |
Estimated fair value | 192
Gross unrealized holding losses | 5
Municipal bonds [Member] |
Marketable Securities [Line Items] |
Estimated fair value, less than 12 months |
Gross unrealized holding losses, less than 12 months |
Estimated fair value, more than 12 months |
Gross unrealized holding losses, more than 12 months |
Estimated fair value |
Gross unrealized holding losses |

X
- 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 No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27337-111563 + Details
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X
- Definition This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities. + References No definition available. + Details
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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 less than twelve months. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for less than twelve months. + References No definition available. + Details
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X
- Definition This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for twelve months or longer. + References No definition available. + Details
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X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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X
- Details
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X
- Details
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