Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Cash flows from operating activities:
Net loss	$ (7,203,000)	$ (11,253,000)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	320,000	392,000
Stock based compensation expense	2,357,000	381,000
Amortization of debt discount/premium, net	1,815,000	1,257,000
Amortization of accelerated debt discount due to conversion		2,486,000
Reserve for excess and slow-moving inventories	98,000	3,744,000
Loss on disposal of equipment		114,000
Gain on extinguishment of debt	(652,000)
Net change in operating assets and liabilities:
Accounts receivable	140,000	(378,000)
Inventories	(1,042,000)	(5,108,000)
Prepaid expenses and other assets	524,000	(65,000)
Accounts payable	(236,000)	1,812,000
Interest payable - related party	(976,000)	(912,000)
Accrued payroll and related expenses	(4,000)	238,000
Deferred revenue – short-term	294,000	167,000
Other current liabilities	(434,000)	(1,607,000)
Long-term deferred revenue and other noncurrent liabilities	(245,000)	(221,000)
Net cash used in operating activities	(5,244,000)	(8,953,000)
Cash flows from investing activities:
Capital expenditures	(80,000)	(23,000)
Net cash used in investing activities	(80,000)	(23,000)
Cash flows from financing activities:
Proceeds from convertible promissory note-related party		4,287,000
Payments on financing lease obligations		(22,000)
Proceeds from issuance of common stock, net of expenses	6,832,000	5,214,000
Proceeds from exercise of options, warrants and pre-funded warrants		1,683,000
Proceeds from note payable		646,000
Net cash provided by financing activities	6,832,000	11,808,000
Effects of foreign currency rate changes on cash and cash equivalents	(1,000)	(5,000)
Net increase (decrease) in cash, cash equivalents and restricted cash	1,507,000	2,827,000
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	8,668,000	6,984,000
Supplemental disclosures of cash flow information:
Cash paid for interest	$ 2,202,000	2,031,000
Supplemental non-cash financing and investing information:
Recording of beneficial conversion feature on debt		4,981,000
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		$ 369,000