Inventories - Schedule of Inventories (Detail) - USD ($)	Mar. 31, 2022	Dec. 31, 2021
Inventory Disclosure [Abstract]
Finished goods	$ 429,506	$ 176,082
Work in process	20,500	23,161
Rental units	62,531	62,531
Parts and subassemblies	559,921	584,996
Total cost	1,072,458	846,770
Less: reserve for rental units	(43,691)	(38,462)
Inventories, net	$ 1,028,767	$ 808,308

Inventory rental units.

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Inventory reserve for rental units.

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- Definition

Amount before valuation and LIFO reserves of completed merchandise or goods expected to be sold within one year or operating cycle, if longer.

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Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

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Gross amount of unprocessed materials to be used in manufacturing or production process and supplies that will be consumed.

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Amount before valuation and LIFO reserves of merchandise or goods in the production process expected to be completed within one year or operating cycle, if longer.

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The aggregate carrying amount as of the balance sheet date of items held by the entity which are partially completed at the time of measurement and unprocessed items that will go through the production process and become part of the final product. Includes supplies used directly or indirectly in the manufacturing or production process. This element may be used when the reporting entity combines work in process and raw materials into an aggregate amount.

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