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Financial Instruments (Details) (USD $) | Jun. 30, 2012 | Dec. 31, 2011
--- | --- | ---
Available-for-sale marketable securities |  |
Amortized Cost | $ 8,903,314 | $ 16,594,470
Gross Unrealized Gains |  |
Gross Unrealized (Losses) | (71) | (2,618)
Fair Value | 8,903,243 | 16,591,852
Cash [Member] |  |
Available-for-sale marketable securities |  |
Amortized Cost | 192,843 | 291,093
Gross Unrealized Gains |  |
Fair Value | 192,843 | 291,093
Cash equivalents [Member] |  |
Available-for-sale marketable securities |  |
Amortized Cost | 7,010,586 | 13,020,168
Gross Unrealized Gains |  |
Fair Value | 7,010,586 | 13,020,168
Marketable debt securities, current [Member] |  |
Available-for-sale marketable securities |  |
Amortized Cost | 1,699,885 | 3,283,209
Gross Unrealized Gains |  |
Gross Unrealized (Losses) | (71) | (2,618)
Fair Value | $ 1,699,814 | $ 3,280,591

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- Definition This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 17 -Subparagraph a(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 03-1 -Paragraph 21 -Subparagraph a(2) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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