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Commitments and Contingencies - Summary of Maturities of Sublease Income and Operating Lease Liabilities (Detail) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Sublease Income
2020 (remaining)	$ 3,801
2021	5,201
2022	5,357
2023	5,518
2024	5,684
Thereafter	39,596
Total	65,157
Operating Lease Liabilities
2020 (remaining)	5,148
2021	6,888
2022	6,201
2023	5,343
2024	5,487
Thereafter	36,261
Total	65,328
Present value adjustment	(25,405)
Total	$ 39,923	$ 40,884

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