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Commitments - Summary of Future Minimum Annual Lease Payments under Operating and Financing Leases (Details) $ in Thousands	Sep. 30, 2019 USD ($)
Financing Leases
Remaining 2019	$ 59
2020	122
2021	7
Total minimum lease payments	188
Less: amount representing interest	(6)
Present value of obligations under leases	182
Less: current portion	(144)
Financing lease liabilities, noncurrent	38
Operating Leases
Remaining 2019	75
2020	205
2021	183
2022	123
2023	100
Thereafter	448
Total minimum lease payments	1,134
Less: amount representing interest	(294)
Present value of obligations under leases	840
Less: current portion	(156)
Noncurrent operating lease liability	$ 684

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