CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Cash flows from operating activities:
Net loss	$ (9,086)	$ (10,115)
Adjustments to reconcile net loss to cash used in operating activities:
Impairment of intangible assets	146
Impairment of stock warrant	1,062
Amortization and depreciation	549	602
Amortization of license fees	125	119
Amortization of ROU assets	151	106
Unrealized (gain) loss on investment	133	(1,549)
Realized (gain) loss on short-term investment securities		(56)
Litigation settlement	0	1,891
Gain on the sale of machinery and equipment	0	(87)
Accretion of non cash interest expense	13	21
Accretion of interest on Panacea investments	(306)
Equity-based employee compensation expense	856	966
(Increase) decrease in assets:
Accounts receivable	(132)	(39)
Inventory	(503)	112
Prepaid expenses and other assets	(2,934)	(345)
Increase (decrease) in liabilities:
Operating lease obligations	(149)	(107)
Accounts payable	(1,033)	(610)
Accrued expenses	(384)	340
Accrued severance	24	0
Deferred income	(5)	7
Net cash provided by (used in) operating activities	(11,473)	(8,744)
Cash flows from investing activities:
Acquisition of patents and trademarks	(198)	(244)
Acquisition of machinery and equipment	(42)	(398)
Proceeds from the sale of machinery and equipment	0	166
Sales and maturities of short-term investment securities	19,272	18,287
Purchase of short-term investment securities	(8,853)	(8,397)
Net cash provided by investing activities	10,179	9,414
Cash flows from financing activities:
Payment on note payable	(542)	(400)
Proceeds from note payable issuance	2,195
Proceeds from SBA loan	1,183
Repayment of SBA loan	(1,183)
Net cash used in financing activities	1,653	(400)
Net increase (decrease) in cash and cash equivalents	359	270
Cash and cash equivalents - beginning of period	485	605
Cash and cash equivalents - end of period	844	875
Net cash paid for:
Cash paid during the period for interest	6	3
Non-cash transactions:
Patent and trademark additions included in accounts payable	54	198
Machinery and equipment additions included in accounts payable	0	58
Right-of-use assets and corresponding operating lease obligations	$ 198	814
Legal settlement included in accrued expenses		$ 1,891