Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Cash flows from operating activities:
Net loss	$ (6,266)	$ (6,329)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation of property and equipment	739	854
AMORTIZATION OF DEBT ISSUANCE COSTS	13
Redeemable warrants valuation adjustment	(2,361)	(103)
Amortization and abandonment of patent and trademark rights	48	125
Equity-based compensation	286	344
Realized gain(loss) on sale of marketable securities	(6)	56
Change in assets and liabilities:
Accounts receivable	(42)
Prepaid expenses and other current assets	(317)	(224)
Other assets	211
Accounts payable	174	(202)
Accrued expenses	340	201
Net cash used in operating activities	(7,181)	(5,278)
Cash flows from investing activities:
Sale of marketable securities	1,699	3,371
Purchase of property, equipment and construction in progress	(20)	(160)
Lease deposit refund		14
Additions to patent and trademark rights	(36)	(282)
Net cash provided by investing activities	1,643	2,943
Cash flows from financing activities:
Payments on capital leases		(1)
Debt issuance costs	(90)
Proceeds from note payable	1,543
Proceeds from sale of stock, net of issuance costs	2,180	4,694
Net cash provided by financing activities	3,633	4,693
Net INCREASE(decrease) in cash and cash equivalents	(1,905)	2,358
Cash and cash equivalents at beginning of period	2,408	2,115
Cash and cash equivalents at end of period	503	4,473
Supplemental disclosures of non-cash investing and financing cash flow information:
Unrealized gain on marketable securities	40	112
Insurance proceeds from legal settlement		1,626
Stock issued for accrued expenses	747
Fair value of redeemable warrants granted	$ 2,050	$ 2,617