Condensed Consolidated Statements of Operations and Comprehensive Loss (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Consolidated Statements of Operations and Comprehensive Loss [Abstract]
Net sales	$ 1,252	$ 1,363	$ 4,144	$ 3,499
Costs and Expenses:
Cost of goods sold	540	915	1,987	2,686
Selling, general and administrative	4,107	3,713	12,098	11,489
Research and development	1,112	985	3,719	2,107
Total costs and expenses	5,759	5,613	17,804	16,282
Loss from operations	(4,507)	(4,250)	(13,660)	(12,783)
Other income (loss), net	(1)	10	(1)	10
Loss before income taxes	(4,508)	(4,240)	(13,661)	(12,773)
Income tax expense	(1)	(1)	(5)	(3)
Net loss	$ (4,509)	$ (4,241)	$ (13,666)	$ (12,776)
Basic and diluted loss per share (in dollars per share)	$ (1.70)	$ (8.50)	$ (9.49)	$ (34.59)
Weighted average shares outstanding - basic and diluted (in shares)	2,646	499	1,915	369
Other comprehensive loss:
Foreign currency translation adjustments	$ 1	$ (1)	$ (4)	$ (2)
Total comprehensive loss	$ (4,508)	$ (4,242)	$ (13,670)	$ (12,778)