Condensed Consolidated Statements of Operations and Comprehensive Loss (Unaudited) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Net revenues	$ 2,201,000	$ 2,242,000	$ 3,718,000	$ 5,442,000
Cost of revenues	1,215,000	4,874,000	2,024,000	6,582,000
Gross profit (loss)	986,000	(2,632,000)	1,694,000	(1,140,000)
Expenses:
Selling, general and administrative	3,502,000	1,978,000	5,494,000	4,070,000
Research and development	622,000	578,000	1,001,000	1,187,000
Total operating expenses	4,124,000	2,556,000	6,495,000	5,257,000
Loss from operations	(3,138,000)	(5,188,000)	(4,801,000)	(6,397,000)
Other expenses:
Interest expense	(1,524,000)	(1,314,000)	(3,043,000)	(4,845,000)
Other income (expenses)	(10,000)	(8,000)	(11,000)	(11,000)
Gain on extinguishment of debt			652,000
Total other expense	(1,534,000)	(1,322,000)	(2,402,000)	(4,856,000)
Net loss	(4,672,000)	(6,510,000)	(7,203,000)	(11,253,000)
Loss attributable to noncontrolling interests	(133,000)	(73,000)	(251,000)	(214,000)
Net loss attributable to common stockholders	(4,539,000)	(6,437,000)	(6,952,000)	(11,039,000)
Net loss	(4,672,000)	(6,510,000)	(7,203,000)	(11,253,000)
Other comprehensive loss:
Foreign currency translation adjustments gain (loss)	12,000	1,000	13,000	39,000
Comprehensive loss	(4,660,000)	(6,509,000)	(7,190,000)	(11,214,000)
Comprehensive loss attributable to noncontrolling interests	(133,000)	(73,000)	(251,000)	(214,000)
Comprehensive loss attributable to common stockholders	$ (4,527,000)	$ (6,436,000)	$ (6,939,000)	$ (11,000,000)
Per share data:
Basic and diluted net loss per common share (in dollars per share)	$ (0.38)	$ (1.02)	$ (0.59)	$ (2.11)
Weighted average common shares outstanding – basic and diluted (in shares)	11,911,784	6,315,566	11,679,075	5,230,921