v3.21.1

Stock incentive plans - Plans (Details) - shares	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
2001 Plan
Stock incentive plans
Number of options outstanding	0
Number of awards made	0
Stock options
Stock incentive plans
Number of options outstanding	96,000	109,000
Stock options | 2011 Plan
Stock incentive plans
Number of options outstanding	96,000
RSUs | 2011 Plan
Stock incentive plans
RSUs outstanding	1,673,000

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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
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(ii)
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Gross number of share options (or share units) granted during the period.

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