Revenue Recognition - Revenues From Contracts With Customers (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Disaggregation Of Revenue [Line Items]
Revenues	$ 86,372	$ 83,910
Western Hemisphere | Operating Segments
Disaggregation Of Revenue [Line Items]
Revenues	52,428	46,221
Eastern Hemisphere | Operating Segments
Disaggregation Of Revenue [Line Items]
Revenues	22,517	23,623
Asia Pacific | Operating Segments
Disaggregation Of Revenue [Line Items]
Revenues	11,427	14,066
Products
Disaggregation Of Revenue [Line Items]
Revenues	67,558	65,434
Products | Western Hemisphere | Operating Segments
Disaggregation Of Revenue [Line Items]
Revenues	41,472	36,376
Products | Eastern Hemisphere | Operating Segments
Disaggregation Of Revenue [Line Items]
Revenues	18,179	18,618
Products | Asia Pacific | Operating Segments
Disaggregation Of Revenue [Line Items]
Revenues	7,907	10,440
Services
Disaggregation Of Revenue [Line Items]
Revenues	18,814	18,476
Services | Western Hemisphere | Operating Segments
Disaggregation Of Revenue [Line Items]
Revenues	10,956	9,845
Services | Eastern Hemisphere | Operating Segments
Disaggregation Of Revenue [Line Items]
Revenues	4,338	5,005
Services | Asia Pacific | Operating Segments
Disaggregation Of Revenue [Line Items]
Revenues	$ 3,520	$ 3,626