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Equity Method Investment - Proportionate share of net loss (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Schedule of Equity Method Investments [Line Items]
Proportionate share of Kleo's net loss	$ 641	$ 348	$ 1,369	$ 566
Kleo
Schedule of Equity Method Investments [Line Items]
Proportionate share of Kleo's net loss	$ 641	$ 348	$ 1,369	$ 566

This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

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