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Property and Equipment, net (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Property and equipment disclosures
Total property and equipment	$ 45,952	$ 43,500
Less: accumulated depreciation	(6,253)	(4,058)
Property and equipment, net	39,699	39,442
Building
Property and equipment disclosures
Total property and equipment	35,167	35,167
Laboratory equipment
Property and equipment disclosures
Total property and equipment	9,568	7,415
Computer equipment
Property and equipment disclosures
Total property and equipment	733	550
Leasehold improvements
Property and equipment disclosures
Total property and equipment	200	177
Software
Property and equipment disclosures
Total property and equipment	118	96
Furniture and office equipment
Property and equipment disclosures
Total property and equipment	$ 166	$ 95

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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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