Stock incentive plans - Plans (Details) - shares	6 Months Ended
Jun. 30, 2020	Dec. 31, 2019
2001 Plan
Stock incentive plans
Number of awards made	0
Stock options
Stock incentive plans
Number of options outstanding	151,000	235,000
Stock options \| 2011 Plan
Stock incentive plans
Number of options outstanding	151,000
RSUs \| 2011 Plan
Stock incentive plans
RSUs outstanding	1,357,000

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No definition available.

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

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
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