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Commitment and Contingencies - Minimum annual lease payments under non-cancelable lease arrangements (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Capital Leases
2021	$ 344
2022	318
2023	231
2024	58
2025	0
Thereafter	0
Total minimum lease payments	951
Less: amount representing interest	(67)
Present value of future minimum lease payments	884
Less: current portion	(308)	$ (238)
Long-term capital lease obligations	576
Operating Leases
2021	590
2022	613
2023	626
2024	640
2025	654
Thereafter	55
Total minimum lease payments	$ 3,178

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Amount of capital lease obligation due within one year or the normal operating cycle, if longer.

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