Stock incentive plans - Plans (Details) - shares	Dec. 31, 2018	Dec. 31, 2017
2011 Plan
Stock incentive plans
Common stock shares reserved for issuance	13,739,820
Number of options outstanding	290,000	1,128,000
2001 Plan
Stock incentive plans
Number of options outstanding	14,000	155,000
Stock options
Stock incentive plans
Number of options outstanding	304,000	1,283,000
Stock options \| 2011 Plan
Stock incentive plans
Number of options outstanding	290,000
Stock options \| 2001 Plan
Stock incentive plans
Number of options outstanding	14,000
RSUs \| 2011 Plan
Stock incentive plans
RSUs outstanding	3,119,000

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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
-Section 50
-Paragraph 2
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