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Leases - Summary of Lease Costs (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Finance lease cost:
Amortization of right-of-use asset	$ 45	$ 45	$ 135	$ 135
Interest expense on lease liability	33	33	98	100
Total finance lease cost	78	78	233	235
Operating lease cost	475	504	1,502	1,537
Short-term and equipment lease cost	16	10	33	31
Sublease income	(6)	(3)	(21)	(13)
Total lease costs	$ 563	$ 589	$ 1,747	$ 1,790

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Amount of interest expense on finance lease liability.

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

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Amount of sublease income excluding finance and operating lease expense.

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