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Segment Reporting and Significant Customers (Tables)
12 Months Ended
Dec. 31, 2018
Segment Reporting [Abstract]  
Schedule of revenue by geographic region
Revenue by geographic region is as follows:
Year Ended December 31,
201820172016
United States$44,378 $24,293 $13,789 
Europe6,215 4,274 2,638 
Total revenue$50,593 $28,567 $16,427