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Stockholders' Equity (Summary of Nonvested Options) (Details) - $ / shares | 3 Months Ended
--- | ---
Mar. 31, 2016 | Mar. 31, 2015
Options |  |
Nonvested at beginning of period | 5,202,095 |
Options granted | 2,225,900 |
Options vested | (972,880) |
Options forfeited | (15,235) |
Nonvested at end of period | 6,439,880 |
Weighted-Average Grant Date Fair Value |  |
Nonvested at beginning of period (in dollars per share) | $ 3.44 |
Options granted (in dollars per share) | 3.37 | $ 3.53
Options vested (in dollars per share) | 3.35 |
Options forfeited (in dollars per share) | 4.89 |
Nonvested at end of period (in dollars per share) | $ 3.42 |

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 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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- Definition Number of options vested. + References No definition available. + Details
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