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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2012
Financial Assets and Liabilities Measured at Fair Value on Recurring Basis | Our significant financial assets and liabilities measured at fair value on a recurring basis as of December 31, 2012 and 2011 were as follows:
|  | December 31, 2012 |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Cash equivalents - money market accounts |  | $ | 34,264,268 |  |  | $ | - |  |  | $ | - |  |  | $ | 34,264,268 |
|  | December 31, 2011 |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Cash equivalents - money market accounts |  | $ | 20,263,766 |  |  | $ | - |  |  | $ | - |  |  | $ | 20,263,766 |
Allowance for Doubtful Accounts |
|  | December 31, |
|  | 2012 |  |  | 2011 |
Balance, beginning of the year |  | $ | 334,473 |  |  | $ | 30,000 |
Amounts provided |  |  | 138,339 |  |  |  | 306,520 |
Amounts written off |  |  | (135,353 | ) |  |  | (2,047 | )
Balance, end of the year |  | $ | 337,459 |  |  | $ | 334,473 |

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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, 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=7578670&loc=d3e19190-110258 + Details
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