Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Cash flows from operating activities:
Net loss	$ (2,047,000)	$ (3,370,000)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	212,000	159,000
Stock based compensation expense	81,000	137,000
Amortization of debt discount	586,000
(Recovery of) reserve for excess and slow-moving inventories	86,000	(29,000)
Change in fair value of derivative obligation	0	(259,000)
Net change in operating assets and liabilities:
Accounts receivable	(485,000)	896,000
Inventories	99,000	(224,000)
Prepaid expenses and other assets	(90,000)	39,000
Accounts payable	38,000	69,000
Accrued payroll and related expenses	(232,000)	(92,000)
Deferred revenue	278,000	259,000
Other current liabilities	(932,000)	356,000
Other noncurrent liabilities	(37,000)	(4,000)
Net cash used in operating activities	(2,443,000)	(2,063,000)
Cash flows from investing activities:
Capital expenditures	(38,000)	(290,000)
Net cash used in investing activities:	(38,000)	(290,000)
Cash flows from financing activities:
Proceeds from long-term debt-related party	1,513,000	500,000
Proceeds from note payable	800,000
Proceeds from exercise of pre-funded warrants	5,000
Proceeds from issuance of common stock, net		1,213,000
Net cash provided by financing activities	2,318,000	1,713,000
Effects of foreign currency rate changes on cash and cash equivalents		(1,000)
Net decrease in cash, cash equivalents and restricted cash	(163,000)	(641,000)
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	3,237,000	3,872,000
Supplemental disclosures of cash flow information:
Cash paid for interest	1,514,000	3,000
Supplemental non-cash financing and investing information:
Recording of beneficial conversion feature on debt	1,513,000
Right-to-use asset acquired under operating lease	966,000
Transfer of equipment to inventories		$ 172,000