Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Cash flows from operating activities:
Net loss	$ (4,743,000)	$ (2,047,000)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	199,000	206,000
Stock-based compensation expense	67,000	81,000
Amortization of debt discount/premium, net	522,000	586,000
Amortization of accelerated debt discount due to conversion	2,486,000
Reserve for excess and slow-moving inventories	6,000	86,000
Reserve for bad debt expense	1,000	6,000
Net change in operating assets and liabilities:
Accounts receivable	(752,000)	(485,000)
Inventories	(400,000)	99,000
Prepaid expenses and other assets	330,000	(90,000)
Accounts payable	1,035,000	38,000
Interest payable – related party	(1,426,000)	(1,053,000)
Accrued payroll and related expenses	118,000	(232,000)
Deferred revenue – short term	(3,000)	278,000
Other current liabilities	129,000	121,000
Long-term deferred revenue and other noncurrent liabilities	(110,000)	(30,000)
Net cash used in operating activities	(2,541,000)	(2,436,000)
Cash flows from investing activities:
Capital expenditures	(23,000)	(38,000)
Net cash used in investing activities:	(23,000)	(38,000)
Cash flows from financing activities:
Proceeds from convertible promissory note-related party	1,869,000	1,513,000
Payment on finance lease obligations	(13,000)	(7,000)
Proceeds from issuance of common stock, net of expenses	3,220,000
Proceeds from the exercise of options, warrants and pre-funded warrants	57,000	5,000
Proceeds from note payable		800,000
Net cash provided by financing activities	5,133,000	2,311,000
Effects of foreign currency rate changes on cash and cash equivalents	(5,000)
Net increase (decrease) in cash, cash equivalents and restricted cash	2,562,000	(163,000)
Cash, cash equivalents and restricted cash at beginning of period	4,157,000	3,400,000	$ 3,400,000
Cash, cash equivalents and restricted cash at end of period	6,719,000	3,237,000	$ 4,157,000
Supplemental disclosures of cash flow information:
Cash paid for interest	1,950,000	1,514,000
Supplemental non-cash financing and investing information:
Recording of beneficial conversion feature on debt	1,869,000	1,513,000
Right-to-use asset acquired under operating lease		966,000
Conversion of Related Party Convertible Promissory Note Into Common Stock [Member]
Supplemental non-cash financing and investing information:
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:
Promissory note converted to common stock	$ 180,000