v3.10.0.1

Stock incentive plans - Plans (Details) - shares	Jan. 01, 2018	Jun. 30, 2018	Dec. 31, 2017
2011 Plan
Stock incentive plans
Annual percentage increase alternative, increase in common stock reserved for issuance as a percentage of common stock outstanding	4.50%
Annual fixed increase alternative, increase in shares of common stock reserved for issuance (in shares)	3,000,000
Stock options
Stock incentive plans
Number of options outstanding		541,000	1,283,000
Stock options | 2011 Plan
Stock incentive plans
Number of options outstanding		425,000
RSUs | 2011 Plan
Stock incentive plans
RSUs outstanding		3,371,000

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- Definition

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- Definition

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

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-Publisher FASB
-Name Accounting Standards Codification
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- Definition

Number of options outstanding, including both vested and non-vested options.

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- Definition

Under the fixed increase alternative, represents the potential annual increase in shares of common stock reserved for issuance as share-based compensation.

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