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Leases - Summary of Operating Lease Costs Included in Research and Development and General and Administrative Expense, as well as Sublease Income (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Leases [Abstract]
Operating lease costs	$ 14,342	$ 8,067
Short-term lease costs	7,339	4,554
Variable lease costs	6,368	4,282
Sublease income	(587)	(525)	$ (176)
Net lease cost	$ 27,462	$ 16,378

X

- Definition

Amount of lease cost recognized by lessee for lease contract.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918686-209980

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No definition available.

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X

- Definition

Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability.

+ References

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X

- Definition

Amount of short-term lease cost, excluding expense for lease with term of one month or less.

+ References

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-Publisher FASB
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X

- Definition

Amount of sublease income excluding finance and operating lease expense.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 20
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X

- Definition

Amount of variable lease cost, excluded from lease liability, recognized when obligation for payment is incurred for finance and operating leases.

+ References

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