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Fair Value Measurement of Assets and Liabilities (Tables) | 3 Months Ended
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Mar. 31, 2012
Fair Value Measurement of Assets and Liabilities [Abstract] |
Financial assets and liabilities measured at fair value on a recurring basis |
Description |  | Balances as of March 31, 2012 |  |  | Quoted Prices in active markets for identical Assets (Level 1) |  |  | Balances as of December 31, 2011 |  |  | Quoted Prices in active markets for identical Assets (Level 1) |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and Cash Equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money Market Funds |  | $ | 24,953,117 |  |  | $ | 24,953,117 |  |  | $ | 20,836,617 |  |  | $ | 20,836,617 |
Investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset backed securities |  |  | 18,261,045 |  |  |  | 18,261,045 |  |  |  | 18,309,316 |  |  |  | 18,309,316 |
Sovereign Debt Securities |  |  | 10,170,152 |  |  |  | 10,170,152 |  |  |  | 10,708,563 |  |  |  | 10,708,563 |
Corporate Debt Securities |  |  | 20,335,233 |  |  |  | 20,335,233 |  |  |  | 17,824,331 |  |  |  | 17,824,331 |
Total financial Assets |  | $ | 73,719,547 |  |  | $ | 73,719,547 |  |  | $ | 67,678,827 |  |  | $ | 67,678,827 |
Fair value of short and long-term investments classified as available for sale securities |
|  | March 31, 2012 |
|  | Gross Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses (1) |  |  | Estimated Fair Value |
Short-term investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sovereign Debt Securities |  | $ | 1,776,034 |  |  | $ | 16,721 |  |  | $ | (12,902 | ) |  | $ | 1,779,853 |
Corporate Debt Securities |  |  | 3,921,896 |  |  |  | 42,568 |  |  |  | (62,360 | ) |  |  | 3,902,104 |
Total Short-term investments |  | $ | 5,697,930 |  |  | $ | 59,289 |  |  | $ | (75,262 | ) |  | $ | 5,681,957 |
Long-term investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sovereign Debt Securities |  | $ | 8,016,383 |  |  | $ | 418,169 |  |  | $ | (44,253 | ) |  | $ | 8,390,299 |
Corporate Debt Securities |  |  | 16,296,878 |  |  |  | 246,235 |  |  |  | (109,984 | ) |  |  | 16,433,129 |
Asset Backed Securities (2) |  |  | 17,702,718 |  |  |  | 769,170 |  |  |  | (210,843 | ) |  |  | 18,261,045 |
Total Long-term investments |  | $ | 42,015,979 |  |  | $ | 1,433,574 |  |  | $ | (365,080 | ) |  | $ | 43,084,473 |
Total |  | $ | 47,713,909 |  |  | $ | 1,492,863 |  |  | $ | (440,342 | ) |  | $ | 48,766,430 |
|  | December 31, 2011 |
|  | Gross Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses (1) |  |  | Estimated Fair Value |
Short-term investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sovereign Debt Securities |  | $ | 1,554,448 |  |  | $ | 322 |  |  | $ | — |  |  | $ | 1,554,770 |
Corporate Debt Securities |  |  | 1,375,006 |  |  |  | — |  |  |  | (20,882 | ) |  |  | 1,354,124 |
Total Short-term investments |  | $ | 2,929,454 |  |  | $ | 322 |  |  | $ | (20,882 | ) |  | $ | 2,908,894 |
Long-term investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sovereign Debt Securities |  | $ | 8,483,883 |  |  | $ | 669,910 |  |  | $ | — |  |  | $ | 9,153,793 |
Corporate Debt Securities |  |  | 16,386,974 |  |  |  | 187,946 |  |  |  | (104,713 | ) |  |  | 16,470,207 |
Asset Backed Securities (2) |  |  | 17,647,012 |  |  |  | 715,749 |  |  |  | (53,445 | ) |  |  | 18,309,316 |
Total Long-term investments |  | $ | 42,517,869 |  |  | $ | 1,573,605 |  |  | $ | (158,158 | ) |  | $ | 43,933,316 |
Total |  | $ | 45,447,323 |  |  | $ | 1,573,927 |  |  | $ | (179,040 | ) |  | $ | 46,842,210 |
(1) | Unrealized losses from securities are primarily attributable to market price movements. Management does not believe any remaining unrealized losses represent other-than-temporary impairments based on our evaluation of available evidence including the credit rating of the investments, as of March 31, 2012 and December 31, 2011.
(2) | Asset backed securities have investment grade credit ratings. These investments are collateralized by real estated and they are guaranteed by the U.S. Federal Gonvernment.
Estimated fair value of short-term and long-term investments |
One year or less |  | $ | 5,681,957 |
One year to two years |  |  | 2,184,022 |
Two years to three years |  |  | 14,481,405 |
Three years to four years |  |  | 10,572,742 |
Four years to five years |  |  | 5,521,910 |
More than five years |  |  | 10,324,394 |
Total |  | $ | 48,766,430 |

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- Definition Tabular disclosure of available-for-sale securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803 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, b -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 Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62586-112803 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 19, 20, 21 -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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27290-111563 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 03-1 -Paragraph 21 -Subparagraph a, b -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 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27357-111563 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27198-111563 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27337-111563 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27161-111563 + Details
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- Definition Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19190-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -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 Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 6 -Footnote 4 -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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19207-110258 + Details
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