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Summary of Significant Accounting Policies - Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Disaggregation of Revenue [Line Items]    
Revenue $ 24,481 $ 20,778
Europe    
Disaggregation of Revenue [Line Items]    
Revenue 9,779 9,407
Latin America    
Disaggregation of Revenue [Line Items]    
Revenue 7,141 6,167
Asia-Pacific/Middle East    
Disaggregation of Revenue [Line Items]    
Revenue 7,471 4,946
Other    
Disaggregation of Revenue [Line Items]    
Revenue $ 90 $ 258