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Balance Sheet Accounts and Supplemental Disclosures - Schedule of Property and Equipment, Net (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 7,975	$ 6,639
Less: accumulated depreciation	2,258	1,214
Property and equipment, net	5,717	5,425
Office equipment
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 1,153	1,097
Office equipment | Minimum
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful life	3 years
Office equipment | Maximum
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful life	7 years
Computer equipment
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 143	124
Property and equipment, estimated useful life	5 years
Software
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 114	87
Property and equipment, estimated useful life	3 years
Lab equipment
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 4,025	3,054
Lab equipment | Minimum
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful life	2 years
Lab equipment | Maximum
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful life	5 years
Leasehold improvements
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 2,540	2,229
Leasehold improvements | Minimum
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful life	6 years
Leasehold improvements | Maximum
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful life	7 years
Construction in process
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 0	$ 48

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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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