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Income taxes (Details 2) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014
Income taxes |  |
Change in valuation allowance | $ 16.3 | $ 9.2
Federal |  |
Operating loss carryforwards |  |
Net operating loss carryforwards | 270.4 |
Operating loss carryforwards associated to exercise of stock options and vesting of restricted stock | 49.2 |
Tax benefit related to operating loss carryforwards | 16.7 |
State |  |
Operating loss carryforwards |  |
Net operating loss carryforwards | $ 198.1 |

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- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 + Details
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