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Effects of Adopting ASU Topic 606, Income Statement Highlights (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
INCOME STATEMENT HIGHLIGHTS [Abstract]
Revenue	$ 34	$ 7	$ 16	$ 6	$ 401	$ 375	$ 396	$ 375	$ 63	$ 1,547	$ 1,550
Loss from operations	(6,439)	(4,948)	(6,462)	(7,608)	(6,042)	(3,562)	(3,811)	(3,906)	(25,457)	(17,321)	(28,505)
Loss before taxes									(25,403)	(17,275)	(28,436)
Net loss	$ (6,417)	$ (4,934)	$ (6,450)	$ (7,605)	$ (6,034)	$ (3,552)	$ (3,798)	$ (3,894)	$ (25,406)	$ (17,278)	$ (28,569)
Basic and diluted loss per share (in dollars per share)	$ (0.09)	$ (0.08)	$ (0.10)	$ (0.13)	$ (0.10)	$ (0.06)	$ (0.07)	$ (0.07)	$ (0.40)	$ (0.30)	$ (0.51)
Weighted average shares outstanding basic and diluted (in shares)									62,985,763	58,354,397	55,984,825
Pre-Topic 606 [Member]
INCOME STATEMENT HIGHLIGHTS [Abstract]
Revenue									$ 1,563
Loss from operations									(23,957)
Loss before taxes									(23,903)
Net loss									$ (23,906)
Basic and diluted loss per share (in dollars per share)									$ (0.38)
Weighted average shares outstanding basic and diluted (in shares)									62,985,763
Adjustment [Member] \| Effects of Adopting Topic 606 [Member] \| ASU Topic 606 [Member]
INCOME STATEMENT HIGHLIGHTS [Abstract]
Revenue									$ (1,500)
Loss from operations									(1,500)
Loss before taxes									(1,500)
Net loss									$ (1,500)
Basic and diluted loss per share (in dollars per share)									$ (0.02)
Weighted average shares outstanding basic and diluted (in shares)									62,985,763