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Commitments and Contingencies - Lease Cost (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Commitments and Contingencies Disclosure [Abstract]
Operating lease cost	$ 1,216	$ 1,165	$ 3,543	$ 3,334
Variable lease cost	0	1	0	4
Total operating lease cost	1,216	1,166	3,543	3,338
Finance lease cost:
Amortization of right-of-use assets	31	41	65	129
Interest on finance lease liabilities	1	1	1	3
Total finance lease cost	32	42	66	132
Total lease cost	$ 1,248	$ 1,208	$ 3,609	$ 3,470

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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

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-SubTopic 20
-Section 50
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Amount of amortization expense attributable to right-of-use asset from finance lease.

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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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