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Stockholders' Equity (Details 8) - $ / shares | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Options |  |  |
Nonvested at beginning of period | 5,090,591 | 5,617,554 |
Options granted | 2,281,786 | 1,661,862 |
Options vested | (2,097,053) | (2,053,427) |
Options forfeited | (73,229) | (135,398) |
Nonvested at end of period | 5,202,095 | 5,090,591 | 5,617,554
Weighted-Average Grant Date Fair Value |  |  |
Nonvested at beginning of period (in dollars per share) | $ 3.34 | $ 3.12 |
Options granted (in dollars per share) | 3.45 | 4.02 | $ 2.79
Options vested (in dollars per share) | 3.16 | 3.12 |
Options forfeited (in dollars per share) | 4.61 | 5.60 |
Nonvested at end of period (in dollars per share) | $ 3.44 | $ 3.34 | $ 3.12

X
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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 options vested. + References No definition available. + Details
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