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Supplemental Balance Sheet Information (Tables) | 3 Months Ended
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Mar. 31, 2018
Supplemental Balance Sheet Information [Abstract] |
Property, Plant and Equipment | Property and equipment, net
| March 31, 2018 |  | December 31, 2017
Scientific equipment | $ | 1,906 |  |  | $ | 1,797 |
Leasehold improvements | 192 |  |  | 192 |
Furniture and fixtures | 31 |  |  | 31 |
Computers and software | 26 |  |  | 26 |
Construction in process | 38 |  |  | 120 |
Property and equipment, gross | 2,193 |  |  | 2,166 |
Less: accumulated depreciation | (918 | ) |  | (849 | )
Property and equipment, net | $ | 1,275 |  |  | $ | 1,317 |
Schedule of Accrued Liabilities | Accrued expenses and other current liabilities
| March 31, 2018 |  | December 31, 2017
Accrued legal expenses | 514 |  |  | 251 |
Accrued payroll-related expenses | 329 |  |  | 718 |
Other accrued expenses | 422 |  |  | 304 |
Accrued expenses and other current liabilities | $ | 1,265 |  |  | $ | 1,273 |

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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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