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Commitments and Contingencies - Summary of Maturities of Sublease Income and Operating Lease Liabilities (Detail) $ in Thousands	Dec. 31, 2019 USD ($)
Sublease Income
2020	$ 4,446
2021	5,202
2022	5,358
2023	5,519
2024	5,684
Thereafter	39,600
Total	65,809
Operating Lease Liabilities
2020	7,023
2021	6,952
2022	6,201
2023	4,950
2024	4,963
Thereafter	34,560
Total	64,649
Present value adjustment	(23,765)
Total	$ 40,884

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