Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Operating activities:
Net loss	$ (5,277)	$ (8,196)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	219	54
Loss on disposal of property and equipment	1
Stock option modification expense	77	243
Non-cash (gain) loss on change in fair value of warrant liability	(971)	501
Changes in operating assets and liabilities:
Decrease (Increase) in Accounts receivable	1,546	(109)
Decrease in Inventory	89	273
Decrease in Prepaid expenses and other assets	379	943
Decrease (Increase) in Other assets long-term	48	(86)
(Decrease) Increase in Accounts payable and accrued liabilities	(56)	602
(Decrease) Increase in Deferred rent	(48)	40
(Decrease) Increase in Deferred revenue	(13)	6
Net cash used in operating activities	(3,575)	(3,344)
Investing activities:
Purchases of property and equipment	(13)	(228)
Net cash used in investing activities	(13)	(228)
Financing activities:
Proceeds from common stock issuances, net	5,585
Proceeds from exercise of options, net	11	129
Proceeds from stock options & restricted stock units (“RSUs”) for taxes	1	17
Settlement of restricted stock for tax withholding		(48)
Exercise of warrants, net		38
Net cash provided by financing activities	5,597	136
Net increase (decrease) in cash and cash equivalents and restricted cash	2,009	(3,436)
Cash, cash equivalents and restricted cash, beginning of period	3,673	9,986
Cash, cash equivalents and restricted cash, end of period	5,682	6,550
Supplemental disclosure of non-cash information
Cumulative effect of adoption of new accounting standard	2,638
Stock issued to consultants for services, included in accounts payable and accrued liabilities		1
Fixed asset purchases, included in accounts payable and accrued liabilities	7	(52)
Equity transferred to warrant liability		58
Proceeds from stock options and restricted stock for taxes, in accounts payable and accrued liabilities	1	17
Employees and Directors [Member]
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation expense for options and stock issued	413	2,135
Nonemployees [Member]
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation expense for options and stock issued	18	250
Severance Paid in Restricted Stock Units to Non-employees [Member]
Supplemental disclosure of non-cash information
Severance paid in RSUs to non-employees		$ 69