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Property and equipment (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Property and equipment
Property and equipment, at cost	$ 152,795	$ 127,086
Less accumulated depreciation and amortization	(114,280)	(85,447)
Property and equipment—net	38,515	41,639
Depreciation expense	28,834	11,126	$ 8,316
Lab equipment
Property and equipment
Property and equipment, at cost	100,249	88,107
Furniture and fixtures
Property and equipment
Property and equipment, at cost	31,611	20,580
Computer equipment
Property and equipment
Property and equipment, at cost	$ 20,935	$ 18,399

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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- Definition

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.

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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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