Nature of Operations and Going Concern (Details) $ in Thousands		12 Months Ended
	Dec. 03, 2013	Dec. 31, 2018 USD ($) a	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Nature Of Operations And Going Concern [Line Items]
Area of land depth, description		The MJ #1 well did not contain hydrocarbons in commercial quantities in the zones tested. As a result of the above determination, in the year ended December 31, 2018, the Company recorded a non-cash impairment charge to its unproved oil and gas properties of $30,906,000.
Net loss		$ (38,511)	$ (9,989)	$ (8,513)
Accumulated deficit		$ (199,115)	$ (160,604)
Megiddo-Jezreel License [Member]
Nature Of Operations And Going Concern [Line Items]
Area of land, approximate | a		99,000
Initial length of lease	3 years
Megiddo-Jezreel License [Member] | Maximum [Member]
Nature Of Operations And Going Concern [Line Items]
Initial length of lease	7 years
Megiddo-Jezreel License [Member] | Minimum [Member]
Nature Of Operations And Going Concern [Line Items]
Initial length of lease	1 year
Jordan Valley License [Member]
Nature Of Operations And Going Concern [Line Items]
Net loss		$ 38,500
Accumulated deficit		$ 199,000