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Commitments and Contingencies - Schedule of Maturity Analysis of Annual Undiscounted Cash Flows of Operating and Finance Lease Liabilities (Detail) $ in Thousands	Dec. 31, 2019 USD ($)
Commitments And Contingencies Disclosure [Abstract]
Operating Leases, 2020	$ 137
Operating Leases, 2021	120
Operating Leases, 2022	110
Operating Leases, 2023	75
Operating Leases, 2024	6
Total lease payments	448
Operating Leases, Less imputed interest	18
Operating Leases, Total	430
Finance Leases, 2020	51
Finance Leases, 2021	5
Total lease payments	56
Finance Leases, Less imputed interest	2
Finance Leases, Total	$ 54

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