Property and Equipment - Summary of Property and Equipment (Details) - USD ($)	Mar. 31, 2019	Dec. 31, 2018
Property Plant And Equipment [Abstract]
Furniture & fixtures	$ 852,132	$ 791,973
Leasehold improvements	1,936,495	1,930,300
Equipment used in manufacturing	2,298,377	2,297,797
Equipment used in research & development	1,456,954	1,456,954
Equipment used in the field	153,720	125,253
Software	373,683	373,683
Construction in progress		19,246
Total property and equipment, gross	7,071,361	6,995,206
Less: accumulated depreciation and amortization	(4,930,254)	(4,621,416)
Property and equipment, net	$ 2,141,107	$ 2,373,790

Field equipment.

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Research and development equipment gross.

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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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Amount before accumulated amortization of capitalized costs for computer software, including but not limited to, acquired and internally developed computer software.

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Amount of structure or a modification to a structure under construction. Includes recently completed structures or modifications to structures that have not been placed into service.

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Amount before accumulated depreciation of equipment commonly used in offices and stores that have no permanent connection to the structure of a building or utilities. Examples include, but are not limited to, desks, chairs, tables, and bookcases.

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Amount before accumulated depreciation of additions or improvements to assets held under a lease arrangement.

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Amount before accumulated depreciation of tangible personal property used to produce goods and services, including, but is not limited to, tools, dies and molds, computer and office equipment.

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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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