CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenue:
Sale of products, net	$ 6,435	$ 5,815	$ 13,493	$ 12,109
Cost of goods sold (exclusive of depreciation shown separately below):
Products	6,234	5,901	13,005	12,298
Gross profit (loss)	201	(86)	488	(189)
Operating expenses:
Selling, general and administrative (including equity-based compensation )	3,501	2,586	6,640	5,060
Impairment of intangible assets	146		146
Depreciation	157	147	313	282
Amortization	189	223	361	438
Total operating expenses	4,954	4,943	9,384	10,218
Operating loss	(4,753)	(5,029)	(8,896)	(10,407)
Other income (expense):
Unrealized (loss) gain on investment	312	(1,424)	(133)	1,549
Impairment of stock warrant	(1,062)		(1,062)
Realized (loss) on short-term investment securities	3	72		56
Litigation expense		(1,891)	0	(1,891)
Gain on the sale of machinery and equipment			0	87
Interest income, net	462	243	1,074	515
Interest expense	(19)	(13)	(31)	(24)
Total other income (expense)	(304)	(3,013)	(152)	292
Loss before income taxes	(5,057)	(8,042)	(9,048)	(10,115)
Income taxes			38
Net loss	(5,057)	(8,042)	(9,086)	(10,115)
Other comprehensive income (loss):
Unrealized gain (loss) on short-term investment securities	241	89	45	236
Reclassification of gain to net loss	(3)	(72)		(56)
Other comprehensive income (loss)	238	17	45	180
Comprehensive loss	$ (4,819)	$ (8,025)	$ (9,041)	$ (9,935)
Net loss per common share - basic and diluted	$ (0.04)	$ (0.06)	$ (0.07)	$ (0.08)
Weighted average common shares outstanding - basic and diluted (in thousands)	138,854	124,662	138,732	124,653
Products Other Than Modified Risk Tobacco Products [Member]
Operating expenses:
Research and development (including equity-based compensation )	$ 957	$ 1,674	$ 1,770	$ 2,914
Modified Risk Tobacco Product [Member]
Operating expenses:
Research and development (including equity-based compensation )	$ 4	$ 313	$ 154	$ 1,524