Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Cash flows from operating activities:
Net loss	$ (7,160)	$ (5,393)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation of property and equipment	340	380
Redeemable warrants valuation adjustment	150	1,039
Fair value of convertible note adjustment		(16)
Change in convertible debt - refinancing		20
Extinguishment of notes payable	142	344
Warrant modification	46
Amortization of patent, trademark rights	67	35
Changes in ROU assets	22	22
Equity-based compensation	346	426
Realized (loss) gain on sale of marketable securities	63
Amortization of finance and debt issuance costs	42	71
Change in assets and liabilities:
Accounts and other receivables	774	1,018
Prepaid expenses and other current assets	730	66
Lease liability	(22)	(28)
Accounts payable	(217)	38
Accrued interest expense	230	(178)
Accrued expenses	(78)
Net cash used in operating activities	(4,525)	(4,234)
Cash flows from investing activities:
Proceeds from sale of marketable securities	8,497
Purchase of marketable securities	(7,590)	(379)
Purchase of property and equipment	(9)	(63)
Purchase of patent and trademark rights	(297)	(184)
Net cash provided by (used in) investing activities	601	(626)
Cash flows from financing activities:
Payment of note payable	(4,283)
Financing obligation payments	(176)	(169)
Proceeds from sale of stock, net of issuance costs	40,821	5,689
Net cash provided by financing activities	36,362	5,520
Net increase in cash and cash equivalents	32,438	660
Cash and cash equivalents at beginning of period	1,470	299
Cash and cash equivalents at end of period	33,908	959
Supplemental disclosures of non-cash investing and financing cash flow information:
Unrealized loss on marketable securities	63
Conversion of series B preferred	41	4,092
Conversion of note payable into shares		1,473
Stock issued to settle accounts payable	10	46
Operating Lease - Right of Use Assets		$ 148