Condensed Consolidated Statements of Operations and Comprehensive Loss (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Condensed Consolidated Statements of Operations and Comprehensive Loss (Unaudited) [Abstract]
Net sales	$ 1,099	$ 864	$ 2,136	$ 1,765
Costs and expenses:
Cost of goods sold	870	616	1,771	1,130
Selling, general and administrative	3,765	2,420	7,776	4,807
Research and development	643	327	1,122	635
Total costs and expenses	5,278	3,363	10,669	6,572
Loss from operations	(4,179)	(2,499)	(8,533)	(4,807)
Other income (expense):
Other income, net	0	5	0	11
Warrant valuation expense	0	0	0	(67)
Change in fair value of warrant liability	0	37	0	1,466
Total other income, net	0	42	0	1,410
Loss before income taxes	(4,179)	(2,457)	(8,533)	(3,397)
Income tax expense, net	(2)	(1)	(2)	(1)
Net loss	$ (4,181)	$ (2,458)	$ (8,535)	$ (3,398)
Basic and diluted loss per share (in dollars per share)	$ (0.93)	$ (9.38)	$ (2.00)	$ (27.77)
Weighted average shares outstanding - basic and diluted (in shares)	4,494	371	4,263	225
Other comprehensive loss:
Foreign currency translation adjustments	$ (2)	$ (5)	$ (1)	$ (6)
Total comprehensive loss	$ (4,183)	$ (2,463)	$ (8,536)	$ (3,404)