Supplementary Balance Sheet Information - Property and Equipment (Details) - USD ($)	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Depreciation and amortization	$ 466,009	$ 494,232
Property and equipment	3,627,719	3,482,116
Less—accumulated depreciation	(3,004,025)	(2,604,293)
Property and equipment, net	623,694	877,823
Furniture and office equipment
Property, Plant and Equipment [Line Items]
Property and equipment	797,739	775,030
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment	1,962,230	1,962,230
Laboratory equipment
Property, Plant and Equipment [Line Items]
Property and equipment	$ 867,750	$ 744,856

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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