Revenue Recognition - Revenues From Contracts With Customers (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Disaggregation Of Revenue [Line Items]
Revenues	$ 73,250	$ 86,372
Western Hemisphere | Operating Segments
Disaggregation Of Revenue [Line Items]
Revenues	48,420	52,428
Eastern Hemisphere | Operating Segments
Disaggregation Of Revenue [Line Items]
Revenues	9,441	22,517
Asia Pacific | Operating Segments
Disaggregation Of Revenue [Line Items]
Revenues	15,389	11,427
Products
Disaggregation Of Revenue [Line Items]
Revenues	55,583	67,558
Products | Western Hemisphere | Operating Segments
Disaggregation Of Revenue [Line Items]
Revenues	37,916	41,472
Products | Eastern Hemisphere | Operating Segments
Disaggregation Of Revenue [Line Items]
Revenues	6,722	18,179
Products | Asia Pacific | Operating Segments
Disaggregation Of Revenue [Line Items]
Revenues	10,945	7,907
Services
Disaggregation Of Revenue [Line Items]
Revenues	17,667	18,814
Services | Western Hemisphere | Operating Segments
Disaggregation Of Revenue [Line Items]
Revenues	10,504	10,956
Services | Eastern Hemisphere | Operating Segments
Disaggregation Of Revenue [Line Items]
Revenues	2,719	4,338
Services | Asia Pacific | Operating Segments
Disaggregation Of Revenue [Line Items]
Revenues	$ 4,444	$ 3,520