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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (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 (Unaudited) [Abstract]
Revenue	$ 16	$ 396	$ 22	$ 771
Operating expense:
Research and development	1,186	957	2,191	1,873
Selling, general and administrative	5,292	3,250	11,901	6,615
Total operating expense	6,478	4,207	14,092	8,488
Loss from operations	(6,462)	(3,811)	(14,070)	(7,717)
Interest income, net	12	13	20	31
Loss before taxes	(6,450)	(3,798)	(14,050)	(7,686)
Provision for income tax	0	0	(5)	(5)
Net loss	$ (6,450)	$ (3,798)	$ (14,055)	$ (7,691)
Basic and diluted loss per share (in dollars per share)	$ (0.10)	$ (0.07)	$ (0.23)	$ (0.13)
Weighted average shares outstanding basic and diluted (in shares)	61,532	58,195	60,835	58,170

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