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Selected Balance Sheet Information (Tables) | 12 Months Ended
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Dec. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Schedule of Other Current Assets [Table Text Block] | ## #### Prepaid expenses and other current assets (in thousands):
|  | December 31,
|  | 2015 |  | 2014
Intrexon prepaid research and development expenses – See Note 7 |  | $ | 643 |  |  | $ | 1,067 |
Prepaid clinical research organization expenses |  |  | 8,329 |  |  |  | — |
Prepaid insurances |  |  | 339 |  |  |  | 228 |
Other prepaid expenses |  |  | 208 |  |  |  | 253 |
Total |  | $ | 9,519 |  |  | $ | 1,548 |
Property, Plant and Equipment [Table Text Block] | #### Property and equipment (in thousands):
|  | December 31,
|  | 2015 |  | 2014
Computer and office equipment |  | $ | 346 |  |  | $ | 93 |
Software |  |  | 11 |  |  |  | 11 |
Leasehold improvements |  |  | 242 |  |  |  | — |
|  |  | 599 |  |  |  | 104 |
Less accumulated depreciation and amortization |  |  | (105 | ) |  |  | (39 | )
Total |  | $ | 494 |  |  | $ | 65 |
Accrued Expenses [Table Text Block] | #### Accrued expenses (in thousands):
|  | December 31,
|  | 2015 |  | 2014
Accrued manufacturing costs |  | $ | — |  |  | $ | 247 |
Accrued vendor payments |  |  | 133 |  |  |  | 176 |
Accrued milestones payments |  |  | — |  |  |  | 350 |
Accrued clinical consulting services |  |  | 164 |  |  |  | 525 |
Total |  | $ | 297 |  |  | $ | 1,298 |

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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 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: 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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 13 -Subparagraph b -Article 5 + Details
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