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Supplemental Balance Sheet and Income Statement Information - Investment income (loss) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Investment income (loss)
Interest and dividend income, including correction	$ (290)
Interest and dividend income		$ 1,230	$ 1,003	$ 3,603
Gains (losses) on marketable securities	228	806	198	(4,765)
Investment income (loss)	$ (62)	$ 2,036	$ 1,201	$ (1,162)

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- Definition

Amount of operating dividend and interest income, including amortization and accretion of premiums and discounts, on securities. Includes error correction from previous filing.

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Amount of operating dividend and interest income, including amortization and accretion of premiums and discounts, on securities.

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- Definition

Amount after accretion (amortization) of discount (premium), and investment expense, of interest income and dividend income on nonoperating securities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.7(a),(b))
-URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.8)
-URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227

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- Definition

Amount of unrealized and realized gain (loss) on investment in marketable security, including other-than-temporary impairment (OTTI).

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