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Commitments and Contingencies - Lease Cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Commitments and Contingencies Disclosure [Abstract]
Operating lease cost	$ 4,498	$ 4,144
Variable lease cost	5	0
Total operating lease cost	4,503	4,144
Finance lease cost:
Amortization of right-of-use assets	169	172
Interest on finance lease liabilities	3	8
Total finance lease cost	172	180
Total lease cost	$ 4,675	$ 4,324

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Finance Lease, Cost

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Finance Lease Cost1 [Abstract]

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Operating Lease Cost, Net

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Amount of interest expense on finance lease liability.

+ 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 (a)
-URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918686-209980

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Amount of amortization expense attributable to right-of-use asset from finance lease.

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-Publisher FASB
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Amount of lease cost recognized by lessee for lease contract.

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Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability.

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Amount of variable lease cost, excluded from lease liability, recognized when obligation for payment is incurred for finance and operating leases.

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