Condensed Consolidated Statements of Operations and Comprehensive Loss (Unaudited) - USD ($)	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Net revenues	$ 2,737,000	$ 2,572,000
Cost of revenues	1,535,000	1,467,000
Gross profit	1,202,000	1,105,000
Selling, general and administrative	1,548,000	1,844,000
Research and development	211,000	306,000
Total operating expenses	1,759,000	2,150,000
Loss from operations	(557,000)	(1,045,000)
Other expenses:
Interest expense	(1,452,000)	(3,903,000)
Loss on retirement of debt	0	(239,000)
Other income (expenses)	(8,000)	(5,000)
Total other expenses	(1,444,000)	(4,137,000)
Net loss	(2,001,000)	(5,182,000)
Loss attributable to noncontrolling interests	(145,000)	(96,000)
Net loss attributable to common stockholders	(1,856,000)	(5,086,000)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Net loss	(2,001,000)	(5,182,000)
Other comprehensive loss:
Foreign currency translation adjustments gain (loss)	0	(6,000)
Comprehensive loss	(2,001,000)	(5,188,000)
Comprehensive loss attributable to noncontrolling interests	(145,000)	(96,000)
Comprehensive loss attributable to common stockholders	$ (1,856,000)	$ (5,092,000)
Earnings Per Share [Abstract]
Basic and diluted net loss per common share (in dollars per share)	$ (0.46)	$ (4.07)
Weighted average common shares outstanding basicand diluted (in shares)	4,025,787	1,249,576