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Geographical Information - Schedule of Revenue and Property and Equipment by Geographic Region (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Revenues from External Customers and Long-Lived Assets          
Revenue $ 61,120 $ 47,727 $ 120,025 $ 94,741  
Property and equipment, net 22,019   22,019   $ 19,888
United States          
Revenues from External Customers and Long-Lived Assets          
Revenue 56,890 44,830 112,061 89,188  
Property and equipment, net 20,089   20,089   17,949
International          
Revenues from External Customers and Long-Lived Assets          
Revenue 4,230 $ 2,897 7,964 $ 5,553  
Property and equipment, net $ 1,930   $ 1,930   $ 1,939