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Summary Of Significant Accounting Policies (Tables) | 9 Months Ended
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Sep. 30, 2017
Summary Of Significant Accounting Policies [Abstract] |
Summary Of Assets And Liabilities Measured At Fair Value On A Recurring Basis |
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﻿ | September 30, 2017 |  | December 31, 2016
﻿(in thousands) | Level 1 |  | Level 2 |  | Level 3 |  | Total |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
﻿Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Cash and cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Cash and money market funds | $ | 22,283 |  | $ | — |  | $ | — |  | $ | 22,283 |  | $ | 14,516 |  | $ | — |  | $ | — |  | $ | 14,516
﻿Commercial paper |  | — |  |  | 3,648 |  |  | — |  |  | 3,648 |  |  | — |  |  | 2,249 |  |  | — |  |  | 2,249
﻿Total cash and cash equivalents |  | 22,283 |  |  | 3,648 |  |  | — |  |  | 25,931 |  |  | 14,516 |  |  | 2,249 |  |  | — |  |  | 16,765
﻿Investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Commercial paper |  | — |  |  | 23,882 |  |  | — |  |  | 23,882 |  |  | — |  |  | 23,583 |  |  | — |  |  | 23,583
﻿Corporate debt securities |  | — |  |  | 9,399 |  |  | — |  |  | 9,399 |  |  | — |  |  | 10,739 |  |  | — |  |  | 10,739
﻿US government & agency securities |  | — |  |  | 24,753 |  |  | — |  |  | 24,753 |  |  | — |  |  | 20,579 |  |  | — |  |  | 20,579
﻿Asset backed securities |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 312 |  |  | — |  |  | 312
﻿Total investments |  | — |  |  | 58,034 |  |  | — |  |  | 58,034 |  |  | — |  |  | 55,213 |  |  | — |  |  | 55,213
﻿Long-term restricted cash: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Cash |  | 4,500 |  |  | — |  |  | — |  |  | 4,500 |  |  | 4,500 |  |  | — |  |  | — |  |  | 4,500
﻿Total assets measured at fair value | $ | 26,783 |  | $ | 61,682 |  | $ | — |  | $ | 88,465 |  | $ | 19,016 |  | $ | 57,462 |  | $ | — |  | $ | 76,478
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﻿Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Financing derivative | $ | — |  | $ | — |  | $ | 170 |  | $ | 170 |  | $ | — |  | $ | — |  | $ | 356 |  | $ | 356
﻿Total liabilities measured at fair value | $ | — |  | $ | — |  | $ | 170 |  | $ | 170 |  | $ | — |  | $ | — |  | $ | 356 |  | $ | 356
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Changes In Fair Value Of Financial Derivative |
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﻿Financing Derivative | Amount
﻿Balance as of December 31, 2016 | $ | 356
﻿Gain on change in estimated fair value |  | (186)
﻿Balance as of September 30, 2017 | $ | 170
﻿
Estimated Fair Value And Carrying Value of Notes |
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﻿ | September 30, 2017 |  | December 31, 2016
﻿ | Fair Value |  | Carrying Value |  | Fair Value |  | Carrying Value
﻿Notes payable | $ | 15,635 |  | $ | 13,363 |  | $ | 19,788 |  | $ | 16,106
﻿
Anti-Dilutive Shares Excluded From Computation Of Diluted Net Loss Per Share |
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﻿ |  | Nine Months Ended September 30, |  |
﻿(in thousands) |  | 2017 |  | 2016 |  |  |  |
﻿Options outstanding |  | 25,133 |  | 22,635 |  |  |  |
﻿

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- Definition Tabular disclosure of financial instruments measured at fair value, including those classified in shareholders' equity measured on a recurring or nonrecurring basis. Disclosures include, but are not limited to, fair value measurements recorded and the reasons for the measurements, level within the fair value hierarchy in which the fair value measurements are categorized and transfers between levels 1 and 2. Nonrecurring fair value measurements are those that are required or permitted in the statement of financial position in particular circumstances. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19279-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2C -URI http://asc.fasb.org/extlink&oid=66048111&loc=SL7498348-110258 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 + Details
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