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Commitments and Contingencies - Summary of Future Minimum Payments under Contractual Obligations (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
2020	$ 5,870
2021	6,390
2022	6,468
2023	6,556
2024	6,694
Thereafter	26,141
Total lease payments	58,119
Imputed interest	(13,713)
Total	44,406
Operating lease liabilities - current (included in Accounts payable and accrued liabilities on the Consolidated Balance Sheet)	3,214	$ 1,408	$ 0
Operating lease liabilities - long-term	$ 41,192		$ 0

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

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