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Note 4 - Balance Sheet Details (Tables) | 12 Months Ended
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Dec. 31, 2014
Disclosure Text Block Supplement [Abstract] |
Property, Plant and Equipment [Table Text Block] |
|  | December 31, |
|  | 2014 |  |  | 2013 |
Scientific equipment |  | $ | 4,793 |  |  | $ | 4,371 |
Computer equipment and software |  |  | 1,133 |  |  |  | 1,080 |
Furniture, fixtures and office equipment |  |  | 351 |  |  |  | 344 |
Leasehold improvements |  |  | 1,376 |  |  |  | 1,360 |
|  |  | 7,653 |  |  |  | 7,155 |
Less: accumulated depreciation and amortization |  |  | (4,833 | ) |  |  | (4,273 | )
|  | $ | 2,820 |  |  | $ | 2,882 |
Schedule of Accrued Liabilities [Table Text Block] |
|  | December 31, |
|  | 2014 |  |  | 2013 |
Accrued employee salaries and benefits |  | $ | 719 |  |  | $ | 796 |
Accrued bonuses |  |  | 2,012 |  |  |  | 1,770 |
Total accrued payroll and employee liabilities |  | $ | 2,731 |  |  | $ | 2,566 |
|  | December 31, |
|  | 2014 |  |  | 2013 |
Accrued professional fees |  | $ | 1,775 |  |  | $ | 69 |
Accrued accounts payable |  |  | 886 |  |  |  | 26 |
Deferred rent |  |  | 105 |  |  |  | 131 |
Other accrued liabilities |  |  | 165 |  |  |  | 138 |
Total other accrued expense |  | $ | 2,931 |  |  | $ | 364 |

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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 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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- Definition Tabular disclosure of the components of accrued liabilities. + References No definition available. + Details
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