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Property and Equipment | 12 Months Ended
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Dec. 31, 2017
Property and Equipment |
Property and Equipment | 7. Property and Equipment Property and equipment consist of the following (in thousands):
|  | December 31, |
|  | 2017 |  | 2016 |
Property and equipment consist of the following: |  |  |  |  |  |  |
Computer equipment |  | $ | 3,746 |  | $ | 3,511 |
Computer software |  |  | 1,236 |  |  | 1,347 |
Research equipment |  |  | 6,379 |  |  | 7,465 |
Furniture and fixtures |  |  | 2,992 |  |  | 3,018 |
Leasehold improvements |  |  | 7,193 |  |  | 6,970 |
Construction in progress |  |  | 31 |  |  | — |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
|  |  | 21,577 |  |  | 22,311 |
Less accumulated depreciation |  |  | (12,515 | ) |  | (12,495 | )
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
|  | $ | 9,062 |  | $ | 9,816 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Depreciation expense was $3.6 million and $3.2 million for the years ended December 31, 2017 and 2016, respectively, and includes depreciation expenses related to capital lease obligations.

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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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