v3.8.0.1

Stock incentive plans - Plans (Details) - shares | Jan. 01, 2018 | Mar. 31, 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 |  | 880,000 | 1,283,000
Stock options | 2011 Plan |  |  |
Stock incentive plans |  |  |
Number of options outstanding |  | 752,000 |
RSUs | 2011 Plan |  |  |
Stock incentive plans |  |  |
RSUs outstanding |  | 3,556,000 |

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