Summarizes Components of Property and Equipment, Net (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 266,457	$ 180,615
Less: accumulated depreciation	(76,027)	(50,995)
Property and equipment, net	190,430	129,620
Land [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	5,183	5,183
Building and Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	39,397	23,108
Software and Computer Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	33,948	30,683
Lab Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	49,571	30,053
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	7,010	7,090
Office Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	1,178	1,157
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	55,019	53,950
Land Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	3,610	3,403
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 71,541	$ 25,988