Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Cash flows from operating activities:
Net loss	$ (11,880,000)	$ (16,811,000)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	633,000	742,000
Stock-based compensation expense	2,560,000	880,000
Amortization of debt discount/premium, net	3,631,000	5,558,000
Reserve for excess and slow-moving inventories	864,000	3,308,000
Reserve for bad debt expense	(56,000)	(12,000)
Loss on disposal of equipment		118,000
Gain on extinguishment of debt	(652,000)
Net change in operating assets and liabilities:
Accounts receivable	703,000	(90,000)
Inventories	(1,031,000)	(6,582,000)
Prepaid expenses and other assets	(700,000)	(106,000)
Accounts payable	(74,000)	(76,000)
Interest payable - related party	149,000	213,000
Accrued payroll and related expenses	(1,000)	61,000
Deferred revenue – short term	111,000	(12,000)
Other current liabilities	(323,000)	(1,128,000)
Long-term deferred revenue and other noncurrent liabilities	(554,000)	(456,000)
Net cash used in operating activities	(6,620,000)	(14,393,000)
Cash flows from investing activities:
Capital expenditures	(93,000)	(23,000)
Net cash used in investing activities	(93,000)	(23,000)
Cash flows from financing activities:
Proceeds from long-term debt		4,287,000
Payments on finance lease obligations		(33,000)
Proceeds from sale of common stock, net of expenses	6,832,000	10,839,000
Proceeds from exercise of warrants and pre-funded warrants		1,683,000
Proceeds from note payable		646,000
Net cash provided by financing activities	6,832,000	17,422,000
Effects of foreign currency rate changes on cash and cash equivalents		(2,000)
Net increase in cash, cash equivalents and restricted cash	119,000	3,004,000
Cash, cash equivalents and restricted cash at beginning of period	7,161,000	4,157,000
Cash, cash equivalents and restricted cash at end of period	7,280,000	7,161,000
Supplemental disclosures of cash flow information:
Cash paid for interest	2,322,000	2,379,000
Supplemental non-cash financing and investing information:
Recording of beneficial conversion feature on debt		4,981,000
Transfer of inventories to equipment	$ 181,000
Conversion of Related Party Convertible Promissory Note Into Common Stock [Member]
Supplemental non-cash financing and investing information:
Related party promissory note converted to common stock		3,000,000
Conversion of January 2019 Amended Notes to Common Stock [Member]
Supplemental non-cash financing and investing information:
Related party promissory note converted to common stock		$ 368,000