Property and equipment (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Property and equipment
Property and equipment, gross	$ 16,386	$ 5,946
Less: accumulated depreciation	(4,339)	(3,023)
Total	12,047	2,923
Depreciation expense	1,600	700
Laboratory and manufacturing equipment
Property and equipment
Property and equipment, gross	5,391	4,127
Laboratory and manufacturing instruments used internally
Property and equipment
Property and equipment, gross	2,800
Less: accumulated depreciation	(1,200)
Office furniture and equipment
Property and equipment
Property and equipment, gross	1,403	789
Computers and software
Property and equipment
Property and equipment, gross	1,103	786
Leasehold improvements
Property and equipment
Property and equipment, gross	$ 8,489	$ 244

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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The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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