Disclosure of detailed information about revenues, geographic information (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Statements [Line Items]
Revenue	$ 376,245	$ 348,644
Percentage of entity's revenue	100.00%	100.00%
United States
Statements [Line Items]
Revenue	$ 331,625	$ 304,116
Percentage of entity's revenue	88.00%	87.00%
Europe
Statements [Line Items]
Revenue	$ 25,661	$ 31,873
Percentage of entity's revenue	7.00%	9.00%
Other
Statements [Line Items]
Revenue	$ 18,959	$ 12,655
Percentage of entity's revenue	5.00%	4.00%

The income arising in the course of an entity's ordinary activities. Income is increases in economic benefits during the accounting period in the form of inflows or enhancements of assets or decreases of liabilities that result in an increase in equity, other than those relating to contributions from equity participants.

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+ Details