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Selected Balance Sheet Information (Tables) | 12 Months Ended
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Dec. 31, 2017
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, 2017 |  | December 31, 2016 |
Prepaid insurance |  | $ | 351 |  | $ | 358 |
Other prepaid expenses |  |  | 290 |  |  | 185 |
Prepaid conferences, travel and other expenses |  |  | 94 |  |  | 295 |
Clinical consulting services refund receivable |  |  | 46 |  |  | - |
Prepaid clinical research organizations |  |  | 46 |  |  | 1,677 |
Total |  | $ | 827 |  | $ | 2,515 |
Property, Plant and Equipment [Table Text Block] | Property and equipment (in thousands):
|  | December 31, 2017 |  | December 31, 2016 |
Computer and office equipment |  | $ | 851 |  | $ | 641 |
Leasehold improvements |  |  | 439 |  |  | 439 |
Software |  |  | 11 |  |  | 11 |
|  |  | 1,301 |  |  | 1,091 |
Less accumulated depreciation and amortization |  |  | (429) |  |  | (186) |
Total |  | $ | 872 |  | $ | 905 |
Accrued Expenses [Table Text Block] | Accrued expenses (in thousands):
|  | December 31, 2017 |  | December 31, 2016 |
Accrued manufacturing costs |  | $ | 661 |  | $ | 14 |
Accrued clinical consulting services |  |  | 658 |  |  | 2,211 |
Accrued vendor payments |  |  | 193 |  |  | 400 |
Other accrued expenses |  |  | 14 |  |  | 2 |
Total |  | $ | 1,526 |  | $ | 2,627 |
Accrued Employee Benefits [Table Text Block] | Accrued employee benefits (in thousands)
|  | December 31, 2017 |  | December 31, 2016 |
Accrued bonus expense |  | $ | 1,283 |  | $ | - |
Accrued severance expense |  |  | 590 |  |  | 52 |
Accrued vacation expense |  |  | 201 |  |  | 261 |
Total |  | $ | 2,074 |  | $ | 313 |

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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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