Revenues (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenues	$ 37,968	$ 40,103	$ 81,563	$ 81,717
United States [Member]
Revenues	19,530	25,780	45,722	52,769
Other Countries Less Than 5% Of Revenues [Member]
Revenues	15,520	12,228	29,686	24,689
Germany [Member]
Revenues	$ 2,918	$ 2,095	$ 6,155	$ 4,259