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Cash And Cash Equivalents And Marketable Securities (Tables) | 12 Months Ended
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Dec. 31, 2016
Cash And Cash Equivalents And Marketable Securities [Abstract] |
Cash, Cash Equivalents And Marketable Securities |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ | Cash, Cash Equivalents and Marketable Securities
﻿ | Amortized Cost |  | Unrealized Gains |  | Unrealized Losses |  | Estimated Fair Value |  | Accrued Interest |  | Total Value
﻿December 31, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Cash | $ | 1,434 |  | $ | — |  | $ | — |  | $ | 1,434 |  | $ | — |  | $ | 1,434
﻿Cash equivalents |  | 12,783 |  |  | — |  |  | — |  |  | 12,783 |  |  | — |  |  | 12,783
﻿Commercial paper |  | 4,497 |  |  | — |  |  | — |  |  | 4,497 |  |  | — |  |  | 4,497
﻿Corporate securities |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | —
﻿ | $ | 18,714 |  | $ | — |  | $ | — |  | $ | 18,714 |  | $ | — |  | $ | 18,714
﻿Reported as: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Cash and cash equivalents | $ | 16,615 |  |  | — |  |  | — |  | $ | 16,615 |  | $ | — |  | $ | 16,615
﻿Marketable securities |  | 2,099 |  |  | — |  |  | — |  |  | 2,099 |  |  | — |  |  | 2,099
﻿ | $ | 18,714 |  | $ | — |  | $ | — |  | $ | 18,714 |  | $ | — |  | $ | 18,714
﻿Maturities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Matures in one year or less | $ | 18,714 |  | $ | — |  | $ | — |  | $ | 18,714 |  | $ | — |  | $ | 18,714
﻿Matures one to three years |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | —
﻿ | $ | 18,714 |  | $ | — |  | $ | — |  | $ | 18,714 |  | $ | — |  | $ | 18,714
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿December 31, 2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Cash | $ | 273 |  | $ | — |  | $ | — |  | $ | 273 |  | $ | — |  | $ | 273
﻿Cash equivalents |  | 22,630 |  |  | — |  |  | — |  |  | 22,630 |  |  | — |  |  | 22,630
﻿Commercial paper |  | 8,396 |  |  | 1 |  |  | (1) |  |  | 8,396 |  |  | — |  |  | 8,396
﻿ | $ | 31,299 |  | $ | 1 |  | $ | (1) |  | $ | 31,299 |  | $ | — |  | $ | 31,299
﻿Reported as: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Cash and cash equivalents | $ | 31,299 |  | $ | 1 |  | $ | (1) |  | $ | 31,299 |  | $ | — |  | $ | 31,299
﻿Marketable securities |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | —
﻿ | $ | 31,299 |  | $ | 1 |  | $ | (1) |  | $ | 31,299 |  | $ | — |  | $ | 31,299
﻿Maturities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Matures in one year or less | $ | 31,299 |  | $ | 1 |  | $ | (1) |  | $ | 31,299 |  | $ | — |  | $ | 31,299
﻿Matures one to three years |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | —
﻿ | $ | 31,299 |  | $ | 1 |  | $ | (1) |  | $ | 31,299 |  | $ | — |  | $ | 31,299
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿
Assets Measured At Fair Value On Recurring Basis |
﻿ |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  |
﻿ | Level 1 |  | Level 2 |  | Level 3 |  | Total
﻿December 31, 2016 |  |  |  |  |  |  |  |  |  |  |
﻿Cash and cash equivalents | $ | 14,217 |  | $ | — |  | $ | — |  | $ | 14,217
﻿Commercial paper |  | — |  |  | 4,497 |  |  | — |  |  | 4,497
﻿ | $ | 14,217 |  | $ | 4,497 |  | $ | — |  | $ | 18,714
﻿December 31, 2015 |  |  |  |  |  |  |  |  |  |  |
﻿Cash and cash equivalents | $ | 22,903 |  | $ | — |  | $ | — |  | $ | 22,903
﻿Commercial paper |  | — |  |  | 8,396 |  |  | — |  |  | 8,396
﻿ | $ | 22,903 |  | $ | 8,396 |  | $ | — |  | $ | 31,299
﻿ |  |  |  |  |  |  |  |  |  |  |
﻿

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- Definition Cash cash equivalents and marketable securities. + References No definition available. + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: 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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