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Commitments and Contingencies - Summary of Maturities of Sublease Income and Operating Lease Liabilities (Detail) $ in Thousands	Sep. 30, 2019 USD ($)
Sublease Income
2020	$ 4,446
2021	5,202
2022	5,358
2023	5,519
Thereafter	45,285
Total	65,810
Operating Lease Liabilities
2019 (remaining)	1,723
2020	7,007
2021	6,935
2022	6,185
2023	4,946
Thereafter	39,523
Total	66,319
Present value adjustment	(26,297)
Total	$ 40,022

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