Deferred Revenue

6 Months Ended

Jun. 30, 2022

Deferred Revenue Disclosure [Abstract]

Deferred Revenue

17. Deferred Revenue

Deferred revenue consists of the following:

	June 30, 2022		December 31, 2021
Satair A/S-exclusive rights	$	655,599	$	717,615
Satair A/S-advance against PO		483,005		490,929
LM Aero-MetaSOLAR commercialization		—		92,698
US Deferred Revenue		75,000		75,000
Innovate UK-R&D tax credit		16,726		18,588
Other deferred revenue		—		21,910
		1,230,330		1,416,740
Less current portion		675,591		779,732
	$	554,739	$	637,008