Significant Accounting Policies (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Significant Accounting Policies (Textual)
Loss	$ (4,614)	$ (4,573)	$ (7,365)	$ (9,149)
Net cash used in operating activities			(1,858)	$ (547)
Accumulated deficit	$ (238,694)		$ (238,694)		$ (231,329)