Inventories (Detail) - USD ($)	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019
Inventory Disclosure [Abstract]
Inventory Write-down	$ 0	$ 2,595,884
Purchased components	716,848	720,209
Finished goods	334,434	443,505
Inventories	$ 1,051,282	$ 1,163,714

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Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of merchandise or goods held by the company that are readily available for sale.

+ References

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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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Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of unprocessed items to be consumed in the manufacturing or production process.

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Amount of loss from reductions in inventory due to subsequent measurement adjustments, including, but not limited to, physical deterioration, obsolescence, or changes in price levels.

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