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Commitments and Contingencies - Lease Cost (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Commitments and Contingencies Disclosure [Abstract]
Operating lease cost	$ 1,164	$ 1,114	$ 2,328	$ 2,169
Variable lease cost	0	2	0	3
Total operating lease cost	1,164	1,116	2,328	2,172
Finance lease cost:
Amortization of right-of-use assets	7	44	34	88
Interest on finance lease liabilities	0	1	0	2
Total finance lease cost	7	45	34	90
Total lease cost	$ 1,171	$ 1,161	$ 2,362	$ 2,262

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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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