Revenue Recognition and Contracts with Customers - Company's total revenue by major product lines (Details)	3 Months Ended
Mar. 31, 2022 USD ($) product	Mar. 31, 2021 USD ($)
Revenue	$ 2,503,051	$ 3,915,389
Number of major product lines \| product	2
Smart Glasses Sales
Revenue	$ 2,503,051	3,805,170
Engineering Services
Revenue		$ 110,219

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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+ Details