UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
General and administrative expenses	$ 5,519	$ 3,763	$ 10,397	$ 7,418
General and Administrative Expense [Member]
General and administrative expenses	5,096	3,302	9,642	6,965
Non Cash Stock Compensation Expense [Member]
Non-cash stock based compensation credit	$ 423	$ 461	$ 755	$ 453