Segment Reporting and Revenue Disaggregation (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($) segment	Jun. 30, 2019 USD ($)
Segment Reporting [Abstract]
Number of reporting segments | segment			1
Segment Reporting and Significant Customers
Revenue	$ 12,183	$ 18,032	$ 33,530	$ 34,282
United States
Segment Reporting and Significant Customers
Revenue	10,984	15,754	30,258	30,109
Europe
Segment Reporting and Significant Customers
Revenue	$ 1,199	$ 2,278	$ 3,272	$ 4,173