Revenue From Contracts With Customers - Revenue by Geographic Area (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Disaggregation of Revenue [Line Items]
Net revenues	$ 53,239	$ 47,200	$ 131,970	$ 105,451
Latin America
Disaggregation of Revenue [Line Items]
Net revenues	22,720	19,910	50,572	37,356
North America
Disaggregation of Revenue [Line Items]
Net revenues	12,182	13,095	32,984	25,452
Europe
Disaggregation of Revenue [Line Items]
Net revenues	8,335	8,202	24,850	19,811
Asia Pacific
Disaggregation of Revenue [Line Items]
Net revenues	2,744	3,718	8,287	11,581
Africa
Disaggregation of Revenue [Line Items]
Net revenues	2,874	1,121	7,541	8,362
Middle East
Disaggregation of Revenue [Line Items]
Net revenues	3,899	717	6,364	1,907
Commonwealth of Independent States
Disaggregation of Revenue [Line Items]
Net revenues	$ 485	$ 437	$ 1,372	$ 982