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Equity Summary of Unvested Stock Options (Details) - $ / shares | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Number of Shares |  |  |
Unvested, beginning of period (in shares) | 7,193,577 |  |
Granted (in shares) | 75,100 |  |
Cancelled (in shares) | (239,322) |  |
Vested (in shares) | (3,961,420) |  |
Unvested, end of period (in shares) | 3,067,935 | 7,193,577 |
Weighted- Average Grant Date Fair Value |  |  |
Unvested, beginning of period (in dollars per share) | $ 3.08 |  |
Granted (in dollars per share) | 5.15 | $ 4.18 | $ 3.08
Cancelled (in dollars per share) | 3.79 |  |
Vested (in dollars per share) | 2.53 |  |
Unvested, end of period (in dollars per share) | $ 3.81 | $ 3.08 |

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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of non-vested options outstanding. + References No definition available. + Details
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- Definition Weighted average grant-date fair value of non-vested options forfeited. + References No definition available. + Details
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