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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%

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