Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Cash flows from operating activities:
Net loss	$ (16,811,000)	$ (10,099,000)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	742,000	805,000
Stock-based compensation expense	880,000	614,000
Amortization of debt discount/premium, net	5,558,000	2,349,000
Reserve for excess and slow-moving inventories	3,308,000	92,000
Reserve for bad debt expense	(12,000)	(60,000)
Change in fair value of derivative		(1,000)
Loss on disposal of equipment	118,000	70,000
Loss on extinguishment of debt		840,000
Net change in operating assets and liabilities:
Accounts receivable	(90,000)	301,000
Inventories	(6,582,000)	610,000
Prepaid expenses and other assets	(106,000)	(525,000)
Accounts payable	(76,000)	(966,000)
Interest payable - related party	213,000	355,000
Accrued payroll and related expenses	61,000	(415,000)
Deferred revenue	(12,000)	135,000
Other current liabilities	(1,128,000)	1,143,000
Long-term deferred revenue and other noncurrent liabilities	(456,000)	1,492,000
Net cash used in operating activities	(14,393,000)	(3,260,000)
Cash flows from investing activities:
Capital expenditures	(23,000)	(182,000)
Net cash used in investing activities	(23,000)	(182,000)
Cash flows from financing activities:
Proceeds from long-term debt	4,287,000	1,800,000
Proceeds from convertible promissory note-related party		1,513,000
Payments on finance lease obligations	(33,000)	(24,000)
Proceeds from sale of common stock, net of expenses	10,839,000	756,000
Proceeds from exercise of warrants and pre-funded warrants	1,683,000	154,000
Proceeds from note payable	646,000
Net cash provided by financing activities	17,422,000	4,199,000
Effects of foreign currency rate changes on cash and cash equivalents	(2,000)
Net increase in cash, cash equivalents and restricted cash	3,004,000	757,000
Cash, cash equivalents and restricted cash at beginning of period	4,157,000	3,400,000
Cash, cash equivalents and restricted cash at end of period	7,161,000	4,157,000
Supplemental disclosures of cash flow information:
Cash paid for interest	2,379,000	177,000
Supplemental non-cash financing and investing information:
Recording of beneficial conversion feature on debt	4,981,000	2,313,000
Right-to-use asset acquired under operating lease		966,000
Conversion of debt to common stock	3,368,000	432,000
Fair value of amended convertible note issued in connection with the extinguishment of original convertible note		1,473,000
Transfer of equipment to inventories		44,000
Transfer of inventories to equipment		$ 22,000