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Marketable Securities - Available-for-sale Securities by Major Security Type (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Marketable Securities
Amortized cost	$ 2,848	$ 4,521
Gross unrealized holding gains	31	26
Gross unrealized holding losses		(4)
Estimated fair value	2,879	4,543
Corporate bonds and notes
Marketable Securities
Amortized cost	1,312	1,814
Gross unrealized holding gains	26	21
Gross unrealized holding losses		(3)
Estimated fair value	1,338	1,832
Municipal bonds
Marketable Securities
Amortized cost	1,536	2,707
Gross unrealized holding gains	5	5
Gross unrealized holding losses		(1)
Estimated fair value	$ 1,541	$ 2,711

X

- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

No definition available.

+ Details

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X

- Definition

Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as 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=121645371&loc=d3e27161-111563

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- Definition

Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

+ References

No definition available.

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- Definition

This item represents the cost of debt and equity 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.

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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.

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