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Property and Equipment | 9 Months Ended
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Sep. 30, 2013
Property and Equipment | 3. Property and Equipment Property and equipment consists of the following:
|  | Year Ended December 31, |  |  | Nine Months Ended September 30, 2013 |
|  | 2011 |  |  | 2012 |  |
|  |  |  |  |  |  |  | (unaudited) |
Computer equipment |  | $ | 1,951,246 |  |  | $ | 2,003,706 |  |  | $ | 2,172,535 |
Software |  |  | 1,323,081 |  |  |  | 1,323,081 |  |  |  | 1,323,081 |
Furniture |  |  | 599,650 |  |  |  | 599,650 |  |  |  | 599,650 |
Lab equipment |  |  | 7,910,207 |  |  |  | 8,747,790 |  |  |  | 10,603,598 |
Office equipment |  |  | 51,360 |  |  |  | 51,360 |  |  |  | 51,360 |
Leasehold improvements |  |  | 4,831,706 |  |  |  | 4,881,706 |  |  |  | 4,893,770 |
Property and equipment |  |  | 16,667,250 |  |  |  | 17,607,293 |  |  |  | 19,643,994 |
Less accumulated depreciation and amortization |  |  | (13,379,567 | ) |  |  | (14,339,497 | ) |  |  | (15,174,112 | )
Property and equipment, net |  | $ | 3,287,683 |  |  | $ | 3,267,796 |  |  | $ | 4,469,882 |
Depreciation and amortization expense for the years ended December 31, 2011 and 2012 was $1,147,300 and $959,930, respectively, and $722,496 and $834,615 for the nine months ended September 30, 2012 and 2013, respectively.

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- Definition The entire disclosure for long-lived, physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, accounting policies and methodology, roll forwards, depreciation, depletion and amortization expense, including composite depreciation, accumulated depreciation, depletion and amortization expense, useful lives and method used, income statement disclosures, assets held for sale and public utility disclosures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6391110&loc=d3e2921-110230 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13-14) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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