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Property and Equipment, net - Summary of Property and Equipment, Net (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Total property and equipment, gross	$ 56,547	$ 43,376
Accumulated depreciation	(18,623)	(12,046)
Total property and equipment, net	37,924	31,330
Computer Equipment [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment, gross	727	727
Furniture, Fixtures and Other [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment, gross	3,416	3,215
Laboratory Equipment [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment, gross	23,895	16,640
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment, gross	25,473	21,400
Construction Work in Process [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment, gross	$ 3,036	$ 1,394

X

- Definition

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

+ References

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-Publisher FASB
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-SubTopic 10
-Section 50
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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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