Segment and Geographic Information - Geographic (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Segment Reporting Information [Line Items]
Revenues	$ 16,083	$ 4,000	$ 46,028	$ 11,529
International
Segment Reporting Information [Line Items]
Revenues	10,091	3,875	31,688	11,214
United States
Segment Reporting Information [Line Items]
Revenues	$ 5,992	$ 125	$ 14,340	$ 315

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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+ Details