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Fair Value of Financial Instruments (Valuation of Securities Using Fair Value Hierarchy) (Details) (USD $) | Dec. 31, 2014 | Dec. 31, 2013
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United States |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Securities, fair value | $ (17,096,060)us-gaap_InvestmentsFairValueDisclosure / invest_InvestmentGeographicRegionAxis = country_US | $ 1,642,450 us-gaap_InvestmentsFairValueDisclosure / invest_InvestmentGeographicRegionAxis = country_US
Short-Term Investments |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Securities, fair value | 30,998,094 us-gaap_InvestmentsFairValueDisclosure / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ShortTermInvestmentsMember | 59,154,742 us-gaap_InvestmentsFairValueDisclosure / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ShortTermInvestmentsMember
Fair Value, Inputs, Level 1 | United States |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Securities, fair value | (17,096,060)us-gaap_InvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / invest_InvestmentGeographicRegionAxis = country_US | 1,642,450 us-gaap_InvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / invest_InvestmentGeographicRegionAxis = country_US
Fair Value, Inputs, Level 1 | Short-Term Investments |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Securities, fair value | 30,998,094 us-gaap_InvestmentsFairValueDisclosure / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ShortTermInvestmentsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 59,154,742 us-gaap_InvestmentsFairValueDisclosure / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ShortTermInvestmentsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Fair Value, Inputs, Level 2 | United States |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Securities, fair value | 0 us-gaap_InvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / invest_InvestmentGeographicRegionAxis = country_US | 0 us-gaap_InvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / invest_InvestmentGeographicRegionAxis = country_US
Fair Value, Inputs, Level 2 | Short-Term Investments |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Securities, fair value | 0 us-gaap_InvestmentsFairValueDisclosure / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ShortTermInvestmentsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 0 us-gaap_InvestmentsFairValueDisclosure / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ShortTermInvestmentsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Fair Value, Inputs, Level 3 | United States |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Securities, fair value | 0 us-gaap_InvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / invest_InvestmentGeographicRegionAxis = country_US | 0 us-gaap_InvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / invest_InvestmentGeographicRegionAxis = country_US
Fair Value, Inputs, Level 3 | Short-Term Investments |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Securities, fair value | $ 0 us-gaap_InvestmentsFairValueDisclosure / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ShortTermInvestmentsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | $ 0 us-gaap_InvestmentsFairValueDisclosure / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ShortTermInvestmentsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member

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- Definition Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Available-for-Sale Securities -URI http://asc.fasb.org/extlink&oid=6505594 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Trading Securities -URI http://asc.fasb.org/extlink&oid=6526789 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Subparagraph a, f, g -Article 7 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 35 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=27723805&loc=d3e24584-111560 + Details
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