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Property and Equipment | 12 Months Ended
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Dec. 31, 2017
Property, Plant and Equipment |
Property and Equipment | 7. Property and Equipment Property and equipment consisted of the following at December 31, 2016 and 2017 (in thousands):
|  |  | Lives in years |  |  | December 31, |
|  |  | 2016 |  |  | 2017 |
Leasehold improvements |  |  | 5 to 15 |  |  |  | $ | 792 |  |  |  |  | $ | 835 |  |
Research and laboratory equipment |  |  | 3 to 5 |  |  |  |  | 4,438 |  |  |  |  |  | 4,854 |  |
Office equipment and furniture |  |  | 3 to 5 |  |  |  |  | 1,157 |  |  |  |  |  | 1,236 |  |
|  |  |  |  |  |  |  | 6,387 |  |  |  |  |  | 6,925 |  |
Less: accumulated depreciation and amortization |  |  |  |  |  |  |  | (6,342) |  |  |  |  |  | (6,896) |  |
|  |  |  |  |  |  | $ | 45 |  |  |  |  | $ | 29 |  |
Depreciation and amortization expense for property and equipment was $0.1 million and $32,000 for the years ended December 31, 2016 and 2017, respectively. During the year ended December 31, 2016, the Company sold fully depreciated assets for proceeds of approximately $12,000. The Company did not sell any property or equipment during the year ended December 31, 2017.

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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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