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Property and Equipment | 12 Months Ended
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Dec. 31, 2014
Property and Equipment |
Property and Equipment | 6. Property and Equipment Property and equipment and related accumulated depreciation are as follows (in thousands):
|  | As of December 31, |
|  | 2014 |  | 2013 |
Laboratory equipment |  | $ | 4,093 |  | $ | 1,377 |
Furniture |  |  | 207 |  |  | 106 |
Computer equipment |  |  | 7 |  |  | 7 |
Leasehold improvements |  |  | 198 |  |  | 78 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total property and equipment, gross |  |  | 4,505 |  |  | 1,568 |
Less: accumulated depreciation |  |  | (1,138 | ) |  | (688 | )
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total property and equipment, net |  | $ | 3,367 |  | $ | 880 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
We recorded depreciation and amortization expense of $0.5 million, $0.2 million and $0.1 million for the years ended December 31, 2014, 2013, and 2012, respectively. In July 2013, we entered into a master services agreement with a new global third party manufacturer to provide services for the manufacture of AUGMENT to replace our existing contract manufacturer. As a consequence of the contract manufacturer transition, we determined that we would no longer use certain laboratory equipment, and as such, recorded an impairment loss of $0.4 million during the year ended December 31, 2013. The loss was included within research and development expense.

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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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