Property and Equipment, Net - Summary of Property and Equipment (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 211,754	$ 201,334
Less: accumulated depreciation	(24,124)	(17,117)
Total	187,630	184,217
Land [Member]
Property Plant And Equipment [Line Items]
Property and equipment, gross	6,488	6,417
Buildings and Leasehold Improvements [Member]
Property Plant And Equipment [Line Items]
Property and equipment, gross	108,021	109,172
Laboratory and Manufacturing Equipment [Member]
Property Plant And Equipment [Line Items]
Property and equipment, gross	34,500	31,173
Office and Computer Equipment [Member]
Property Plant And Equipment [Line Items]
Property and equipment, gross	1,779	2,659
Right-of-Use Assets under Finance Lease [Member]
Property Plant And Equipment [Line Items]
Property and equipment, gross	14,415	14,753
Construction-in-Process, Not Yet Available for Use [Member]
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 46,551	$ 37,160

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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