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Fair Value Measurement (Tables) | 9 Months Ended
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Sep. 30, 2013
Assets Measured at Fair Value on Recurring Basis | The following fair value hierarchy table presents information about each major category of the Company’s assets measured at fair value on a recurring basis as of September 30, 2013:
|  | Fair value measurement at reporting date using: |
|  | Quoted prices in active markets for identical assets (Level 1) |  |  | Significant other observable inputs (Level 2) |  |  | Significant unobservable inputs (Level 3) |  |  | Total |
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 9,188,883 |  |  | $ | — |  |  | $ | — |  |  | $ | 9,188,883 |
U.S. Government and agency securities |  |  | 2,547,978 |  |  |  | 3,133,949 |  |  |  | — |  |  |  | 5,681,927 |
Corporate and other debt securities |  |  | — |  |  |  | 19,179,013 |  |  |  | — |  |  |  | 19,179,013 |
Total |  | $ | 11,736,861 |  |  | $ | 22,312,962 |  |  | $ | — |  |  | $ | 34,049,823 |
Roll Forward of Fair Value of Contingent Consideration | The following table provides a roll forward of the fair value of the contingent consideration:
Balance at December 31, 2012 |  | $ | 2,899,076 |
Additions |  |  | — |
Payments |  |  | (1,341,339 | )
Changes in fair value |  |  | 46,521 |
Balance at September 30, 2013 |  | $ | 1,604,258 |

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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=25499696&loc=d3e19190-110258 Reference 2: 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=25499696&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of the fair value measurement of liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets), and gains or losses recognized in other comprehensive income (loss) and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs) by class of liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19279-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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