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Investments and Fair Value of Financial Instruments - Marketable Securities in an Unrealized Loss Position (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Less than 12 months: Fair Value	$ 35,717	$ 13,960
Less than 12 months: Gross Unrealized Losses	(65)	(4)
12 Months of more: Fair Value	0	0
12 months or more: Gross Unrealized Losses	0	0
Total: Fair Value	35,717	13,960
Total: Gross Unrealized Losses	(65)	(4)
U.S. states and municipalities
Debt Securities, Available-for-sale [Line Items]
Less than 12 months: Fair Value	3,590	1,408
Less than 12 months: Gross Unrealized Losses	(6)	(1)
12 Months of more: Fair Value	0	0
12 months or more: Gross Unrealized Losses	0	0
Total: Fair Value	3,590	1,408
Total: Gross Unrealized Losses	(6)	(1)
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Less than 12 months: Fair Value	32,127	12,552
Less than 12 months: Gross Unrealized Losses	(59)	(3)
12 Months of more: Fair Value	0	0
12 months or more: Gross Unrealized Losses	0	0
Total: Fair Value	32,127	12,552
Total: Gross Unrealized Losses	$ (59)	$ (3)

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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- 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

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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

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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.

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- Definition

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+ References

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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.

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