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Property and equipment (Tables) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 | Dec. 31, 2017
Property, Plant and Equipment [Abstract] |  |
Schedule of property and equipment and related accumulated depreciation | Property and equipment and related accumulated depreciation and amortization are as follows (in thousands):
| As of June 30, |  | As of December 31,
| 2018 |  | 2017
Laboratory equipment | $ | 1,732 |  |  | $ | 3,480 |
Furniture | 230 |  |  | 371 |
Computer equipment | 13 |  |  | 208 |
Leasehold improvements | 288 |  |  | 2,754 |
Total property and equipment, gross | 2,263 |  |  | 6,813 |
Less: accumulated depreciation and amortization | (1,860 | ) |  | (3,700 | )
Total property and equipment, net | $ | 403 |  |  | $ | 3,113 |
| Property and equipment are depreciated over the following periods:
Laboratory equipment |  | 3 - 5 years
Furniture |  | 5 years
Computer equipment |  | 3 years
Leasehold improvements |  | Shorter of asset life or lease term
Property and equipment, net as of December 31, 2017 and 2016 follows (in thousands):
| As of December 31,
| 2017 |  | 2016
Laboratory equipment | $ | 3,480 |  |  | $ | 5,184 |
Furniture | 371 |  |  | 793 |
Computer equipment | 208 |  |  | 208 |
Leasehold improvements | 2,754 |  |  | 2,815 |
Total property and equipment, gross | 6,813 |  |  | 9,000 |
Less: accumulated depreciation and amortization | (3,700 | ) |  | (3,428 | )
Total property and equipment, net | $ | 3,113 |  |  | $ | 5,572 |

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- Definition Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. + 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 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(13)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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