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Geographic information (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($) segment	Dec. 31, 2017 USD ($)
Segments, Geographical Areas [Abstract]
Number of operating segments | segment	1
Segment Reporting Information [Line Items]
Total assets	$ 1,119,222	$ 391,653
Property and equipment, net	12,694	8,376
Revenue	264,734	194,392
United States
Segment Reporting Information [Line Items]
Total assets	1,013,977	278,108
Property and equipment, net	10,497	6,272
Revenue	93,694	49,155
Non-US
Segment Reporting Information [Line Items]
Total assets	105,245	113,545
Property and equipment, net	2,197	2,104
Revenue	$ 171,040	$ 145,237

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- Definition

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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