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Marketable Securities - Available-for-sale Marketable Securities in Gross Unrealized Loss Position (Details) $ in Thousands	Jun. 30, 2020 USD ($)
Marketable Securities [Line Items]
Estimated fair value, less than 12 months	$ 189
Gross unrealized holding losses, less than 12 months	8
Estimated fair value, more than 12 months
Gross unrealized holding losses, more than 12 months
Estimated fair value	189
Gross unrealized holding losses	8
Corporate bonds and notes [Member]
Marketable Securities [Line Items]
Estimated fair value, less than 12 months	189
Gross unrealized holding losses, less than 12 months	8
Estimated fair value, more than 12 months
Gross unrealized holding losses, more than 12 months
Estimated fair value	189
Gross unrealized holding losses	8
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_
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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=118939692&loc=d3e27337-111563

+ Details

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- 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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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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- 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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- 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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