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Other Balance Sheet Details (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 41,607	$ 88,033
Less: accumulated depreciation and amortization	(11,681)	(9,310)
Property and equipment, net	29,926	78,723
Laboratory equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	17,179	11,466
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property and equipment, gross	4,639	3,840
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	13,888	3,640
Buildings
Property, Plant and Equipment [Line Items]
Property and equipment, gross	0	3,876
Construction in progress
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 5,901	$ 65,211

X

- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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