Interim Period Reporting (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		6 Months Ended
	Mar. 31, 2017	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Interim Period Reporting (Textual)
Net loss		$ (1,264)	$ (964)	$ (1,837)	$ (1,657)
Accumulated deficit		$ (187,059)		(187,059)		$ (185,222)
Net cash used in operating activities				$ (1,475)	$ (1,431)
Shelf registration common stock offering price	$ 20,000
Shelf registration statement expiration date	Mar. 24, 2020