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Leases - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Leases [Abstract]
Lessor, Operating Lease Maturity Year			2042
Weighted-average discount rate of operating leases	0.85%		0.85%
Weighted average remaining life of operating leases	6 years		6 years
Rental expenses	$ 1,200	$ 1,600	$ 4,000	$ 4,900
Sublease Income	166,000	$ 184,000	479,000	$ 549,000
Minimum rental to be received in future on subleases	$ 1,500		$ 1,500
Sublease contract maturity year			2026

X

- Definition

Lessor, operating lease maturity year.

+ References

No definition available.

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- Definition

Sublease contract expiration period.

+ References

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- Definition

Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

+ References

No definition available.

+ Details

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- References

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- Definition

Weighted average discount rate for operating lease calculated at point in time.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (g)(4)
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-Section 55
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-URI http://asc.fasb.org/extlink&oid=121568110&loc=SL77918982-209971

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- Definition

Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
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- Definition

Contractually required future rental payments receivable on noncancelable subleasing arrangements.

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-Publisher FASB
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- Definition

Amount of sublease income excluding finance and operating lease expense.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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