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Organization of the Company and Basis of Presentation (Detail Textuals) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	12 Months Ended
	May 27, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Organization of the Company
Net loss		$ (7,470)	$ (11,791)
Accumulated deficit		(342,509)	(335,039)
Cash and cash equivalents		$ 23,910	$ 16,520	$ 20,440
Stockholders' equity, reverse stock split	one-for-twelve
Common stock, par value (in dollars per share)		$ 0.001	$ 0.001

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