Property and equipment (Details) - USD ($)	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Property and equipment
Property and equipment, at cost	$ 127,086	$ 98,772
Less accumulated depreciation and amortization	(85,447)	(74,322)
Property and equipment—net	41,639	24,450
Depreciation expense	11,126	8,316	$ 7,932
Lab equipment
Property and equipment
Property and equipment, at cost	88,107	69,770
Furniture and fixtures
Property and equipment
Property and equipment, at cost	20,580	16,313
Computer equipment
Property and equipment
Property and equipment, at cost	$ 18,399	$ 12,689

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 aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

+ References

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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.

+ References

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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.

+ References

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