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Geographical Segment Information - Summary of Revenue Generated in Geographic Regions for Years Indicated (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Segment Reporting Information [Line Items]        
Revenues $ 13,737 $ 10,491 $ 37,141 $ 28,325
Revenues | Geographic Concentration        
Segment Reporting Information [Line Items]        
Revenues $ 13,737 $ 10,491 $ 37,141 $ 28,325
Percentage of Revenues 100.00% 100.00% 100.00% 100.00%
Revenues | United States | Geographic Concentration        
Segment Reporting Information [Line Items]        
Revenues $ 13,518 $ 10,398 $ 36,388 $ 28,017
Percentage of Revenues 98.00% 99.00% 98.00% 99.00%
Revenues | International | Geographic Concentration        
Segment Reporting Information [Line Items]        
Revenues $ 219 $ 93 $ 753 $ 308
Percentage of Revenues 2.00% 1.00% 2.00% 1.00%