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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2016
Income Taxes [Abstract] |
Schedule Of Deferred Tax Assets And Valuation Allowance |
﻿ |  |  |  |  |
﻿ | December 31,
﻿ | 2016 |  | 2015
﻿Deferred tax assets: |  |  |  |  |
﻿Net operating loss carryforwards | $ | 22,300 |  | $ | 17,100
﻿Stock-related compensation |  | 9,100 |  |  | 10,600
﻿Research & development credit carryforwards |  | 6,200 |  |  | 6,000
﻿Other |  | 200 |  |  | 500
﻿ |  | 37,800 |  |  | 34,200
﻿Valuation allowance |  | (37,800) |  |  | (34,200)
﻿ | $ | — |  | $ | —
﻿ |  |  |  |  |
﻿
Schedule Of Unrecognized Tax Benefits |
﻿ |  |  |  |  |
﻿ |  |  |  |  |
﻿ | 2016 |  | 2015
﻿Beginning balance | $ | 4,000 |  | $ | 3,900
﻿Additions based on tax positions related to the current year |  | 200 |  |  | 100
﻿Ending balance | $ | 4,200 |  | $ | 4,000
﻿ |  |  |  |  |
﻿

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- Definition Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32537-109319 + Details
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- Definition Tabular disclosure for tax positions taken in the tax returns filed or to be filed for which it is more likely than not that the tax position will not be sustained upon examination by taxing authorities and other income tax contingencies. Includes, but is not limited to, interest and penalties, reconciliation of unrecognized tax benefits, unrecognized tax benefits that would affect the effective tax rate, tax years that remain subject to examination by tax jurisdictions, and information about positions for which it is reasonably possible that amounts unrecognized will significantly change within 12 months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -URI http://asc.fasb.org/extlink&oid=65882285&loc=SL6600010-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32718-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32840-109319 + Details
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