Revenue From Contracts With Customers - Disaggregation of Revenue Based on Timing of Revenue Recognition (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Revenue From Contracts With Customers [Abstract]
Products and services transferred at a point in time	$ 2,754	$ 3,189	$ 8,819	$ 10,152
Products and services transferred over time	3,319	2,898	9,674	8,429
Total revenue from contracts with customers	$ 6,073	$ 6,087	$ 18,493	$ 18,581