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Property and Equipment | 12 Months Ended
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Dec. 31, 2017
Property and Equipment |
Property and Equipment | 6. Property and Equipment Property and equipment and related accumulated depreciation were as follows (in thousands):
|  |  |  | December 31, |
|  | Estimated Useful Life (Years) |  | 2017 |  | 2016 |
Lab equipment |  | 3 |  | $ | 1,470 |  | $ | 1,565 |
Computer equipment |  | 3 |  |  | 165 |  |  | 166 |
Furniture and fixtures |  | 5 |  |  | 77 |  |  | 77 |
Leasehold improvements |  | Lesser of useful life or remaining lease term |  |  | 264 |  |  | 259 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
|  |  |  |  | 1,976 |  |  | 2,067 |
Less accumulated depreciation and amortization |  |  |  |  | (1,655 | ) |  | (1,499 | )
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total property and equipment, net |  |  |  | $ | 321 |  | $ | 568 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Depreciation and amortization expense was $0.3 million, $0.4 million and $0.2 million for the years ended December 31, 2017, 2016 and 2015, 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 -URI http://asc.fasb.org/topic&trid=2155823 + Details
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