Condensed Consolidated Statements of Operations and Comprehensive Loss (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Consolidated Statements of Operations and Comprehensive Loss [Abstract]
Net sales	$ 1,677	$ 1,099	$ 2,892	$ 2,136
Costs and Expenses:
Cost of goods sold	835	870	1,447	1,771
Selling, general and administrative	3,973	3,765	7,991	7,776
Research and development	1,297	643	2,607	1,122
Total costs and expenses	6,105	5,278	12,045	10,669
Loss from operations	(4,428)	(4,179)	(9,153)	(8,533)
Loss before income taxes	(4,428)	(4,179)	(9,153)	(8,533)
Income tax expense	(2)	(2)	(4)	(2)
Net loss	$ (4,430)	$ (4,181)	$ (9,157)	$ (8,535)
Basic and diluted loss per share (in dollars per share)	$ (1.93)	$ (13.03)	$ (8.82)	$ (28.03)
Weighted average shares outstanding - basic and diluted (in shares)	2,295	321	1,550	304
Other comprehensive loss:
Foreign currency translation adjustments	$ (3)	$ (2)	$ (5)	$ (1)
Total comprehensive loss	$ (4,433)	$ (4,183)	$ (9,162)	$ (8,536)