Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Cash flows from operating activities:
Net loss	$ (10,099,000)	$ (40,940,000)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	805,000	670,000
Stock-based compensation expense	614,000	652,000
Amortization of debt discount/premium, net	2,349,000	1,174,000
(Recovery of) reserve for excess and slow-moving inventories	92,000	(11,000)
(Recovery of) reserve for bad debt expense	(60,000)	153,000
Change in fair value of derivative obligation	(1,000)	(596,000)
Deferred income tax benefit		(4,730,000)
Loss on disposal of equipment	70,000	1,360,000
Loss on extinguishment of debt	840,000
Impairment of intangible asset		33,081,000
Net change in operating assets and liabilities:
Accounts receivable	301,000	1,045,000
Inventories	610,000	61,000
Prepaid expenses and other assets	(525,000)	370,000
Accounts payable	(966,000)	214,000
Interest payable - related party	355,000	(606,000)
Accrued payroll and related expenses	(415,000)	172,000
Deferred revenue	135,000	24,000
Other current liabilities	1,143,000	922,000
Long term deferred revenue and other noncurrent liabilities	1,492,000	2,000
Net cash used in operating activities	(3,260,000)	(6,983,000)
Cash flows from investing activities:
Capital expenditures	(182,000)	(1,238,000)
Net cash used in investing activities	(182,000)	(1,238,000)
Cash flows from financing activities:
Proceeds from long-term debt	1,800,000
Proceeds from convertible promissory note-related party	1,513,000	500,000
Payments on finance lease obligations	(24,000)	(45,000)
Proceeds from issuance of common stock and pre-funded warrants	756,000	6,629,000
Proceeds from exercise of warrants and pre-funded warrants	154,000	27,000
Net cash provided by financing activities	4,199,000	7,111,000
Effects of foreign currency rate changes on cash and cash equivalents		(3,000)
Net decrease in cash, cash equivalents and restricted cash	757,000	(1,113,000)
Cash, cash equivalents and restricted cash at beginning of period	3,400,000	4,513,000
Cash, cash equivalents and restricted cash at end of period	4,157,000	3,400,000
Supplemental disclosures of cash flow information:
Cash paid for interest	177,000	667,000
Supplemental non-cash financing and investing information:
Recording of beneficial conversion feature on debt	2,313,000	7,200,000
Right-to-use asset acquired under operating lease	966,000
Conversion of debt to common stock	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	172,000
Transfer of inventories to equipment	$ 22,000	$ 420,000