Revenue - Timing of Revenue Recognition (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Disaggregation of Revenue [Line Items]
Total Revenues	$ 4,401	$ 8,948	$ 8,179	$ 19,103
Products transferred at a point in time
Disaggregation of Revenue [Line Items]
Total Revenues	2,932	5,153	5,981	10,567
Products and services transferred over time
Disaggregation of Revenue [Line Items]
Total Revenues	$ 1,469	$ 3,795	$ 2,198	$ 8,536