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Commitments and Contingencies - Schedule of Future Payments Under Noncancelable Operating Leases (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Commitments And Contingencies Disclosure [Abstract]
2020	$ 188
2021	146
Total minimum lease payments	334
Less imputed interest	(10)
Present value of lease liabilities	324
Less current portion	(180)
Non-current operating lease liability	$ 144
2019		$ 180
2020		188
2021		146
Total minimum lease payments		$ 514

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Amount of lessee's undiscounted obligation for lease payments for operating lease.

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