Stock incentive plans - Plans (Details) - shares	3 Months Ended
Mar. 31, 2020	Dec. 31, 2019
2001 Plan
Stock incentive plans
Number of awards made	0
Stock options
Stock incentive plans
Number of options outstanding	190,000	235,000
Stock options \| 2011 Plan
Stock incentive plans
Number of options outstanding	182,000
RSUs \| 2011 Plan
Stock incentive plans
RSUs outstanding	1,244,000

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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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(ii)
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Number of options outstanding, including both vested and non-vested options.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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