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Stockholders' Equity (Details 3) - Warrant [Member] - $ / shares | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jul. 17, 2012 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |  |  |  |
Weighted average fair value per warrant | $ 5.03 | $ 5.85 | $ 5.11 | $ 3.76 | $ 5.84 | $ 4.87
Risk-free interest rate | 0.99% | 1.47% | 1.76% | 2.47% | 2.45% | 1.18%
Expected lives | 7 years 6 months | 3 years | 4 years | 5 years | 6 years | 7 years
Expected volatility | 36.98% | 34.03% | 28.99% | 44.99% | 37.49% | 28.18%

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- Definition Period the instrument, asset or liability is expected to be outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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