v3.19.1

Stock incentive plans - Plans (Details) - shares	Mar. 31, 2019	Dec. 31, 2018
Stock options
Stock incentive plans
Number of options outstanding	300,000	304,000
Stock options | 2011 Plan
Stock incentive plans
Number of options outstanding	290,000
RSUs | 2011 Plan
Stock incentive plans
RSUs outstanding	970,000

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Number of equity instruments other than options outstanding, including both vested and non-vested instruments.

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