Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cash flows from operating activities:
Net loss	$ (2,531,000)	$ (4,743,000)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	166,000	199,000
Stock-based compensation expense	258,000	67,000
Amortization of debt discount/premium	908,000	522,000
Amortization of accelerated debt discount due to conversion		2,486,000
Reserve for excess and slow-moving inventories	(4,000)	6,000
Reserve for bad debt expense		1,000
Gain on extinguishment of debt	(652,000)
Net change in operating assets and liabilities:
Accounts receivable	556,000	(752,000)
Inventories	(718,000)	(400,000)
Prepaid expenses and other assets	148,000	330,000
Accounts payable	(38,000)	1,035,000
Interest payable – related party	(1,532,000)	(1,426,000)
Accrued payroll and related expenses	124,000	118,000
Deferred revenue – short term	88,000	(3,000)
Other current liabilities	(603,000)	129,000
Long-term deferred revenue and other noncurrent liabilities	(122,000)	(110,000)
Net cash used in operating activities	(3,952,000)	(2,541,000)
Cash flows from investing activities:
Capital expenditures	(27,000)	(23,000)
Net cash used in investing activities	(27,000)	(23,000)
Cash flows from financing activities:
Proceeds from convertible promissory note-related party		1,869,000
Payment on finance lease obligations		(13,000)
Proceeds from issuance of common stock, net of expenses	6,832,000	3,220,000
Proceeds from the exercise of options, warrants and pre-funded warrants		57,000
Net cash provided by financing activities	6,832,000	5,133,000
Effects of foreign currency rate changes on cash and cash equivalents		(5,000)
Net increase (decrease) in cash, cash equivalents and restricted cash	2,853,000	2,562,000
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	10,014,000	6,719,000
Supplemental disclosures of cash flow information:
Cash paid for interest	2,142,000	1,950,000
Supplemental non-cash financing and investing information:
Recording of beneficial conversion feature on debt		1,869,000
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		$ 180,000