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Stockholders' Equity And Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2020
Stockholders' Equity And Stock-Based Compensation [Abstract] |
Warrants Outstanding |
﻿ |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  | Number of Shares Outstanding under Warrant
﻿ |  |  |  |  |  | December 31,
﻿Issuance Date |  | Expiration Date |  | Exercise Price Per Share |  | 2020 |  | 2019
﻿ |  |  |  |  |  |  |  |
﻿August 17, 2018 |  | February 17, 2021 |  | 1.25 |  | 554,019 |  | 4,496,116
﻿August 17, 2018 |  | February 17, 2021 |  | 1.59 |  | — |  | 7,975
﻿ |  |  |  |  |  | 554,019 |  | 4,504,091
﻿ |  |  |  |  |  |  |  |
﻿
Stock Option Activity |
﻿ |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  | Number of Options |  |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Term |  | Aggregate Intrinsic Value
﻿ |  |  |  |  |  |  |  | In years |  | In millions
﻿ | Outstanding as of December 31, 2019 |  | 3,210,965 |  | $ | 12.27 |  | 6.05 |  | $ | 4.2
﻿ | Options granted |  | 60,000 |  |  | 7.25 |  |  |  |  |
﻿ | Options exercised |  | (71,105) |  |  | 3.60 |  |  |  |  |
﻿ | Options forfeited/canceled |  | (382,356) |  |  | 20.31 |  |  |  |  |
﻿ | Outstanding as of December 31, 2020 |  | 2,817,504 |  |  | 11.30 |  | 5.60 |  | $ | 6.4
﻿ | Vested and expected to vest at December 31, 2020 |  | 2,817,504 |  |  | 11.30 |  | 5.60 |  | $ | 6.4
﻿ | Exercisable at December 31, 2020 |  | 2,167,633 |  | $ | 13.86 |  | 4.85 |  | $ | 3.7
﻿ |  |  |  |  |  |  |  |  |  |  |
﻿
Information About Stock Options Outstanding |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  | Options outstanding |  | Options exercisable
﻿ |  |  |  |  |  |  |  |  | Weighted |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  | average |  | Weighted |  |  |  | Weighted
﻿ |  |  |  |  |  |  | Number of |  | remaining |  | average |  | Number of |  | average
﻿ | Range of exercise prices |  | outstanding |  | contractual |  | exercise |  | vested |  | exercise
﻿ | From |  | To |  | options |  | life (in years) |  | price |  | options |  | price
﻿ | $ | 0.95 |  | $ | 1.88 |  | 659,688 |  | 8.4 |  | $ | 1.47 |  | 251,613 |  | $ | 1.31
﻿ | $ | 3.24 |  | $ | 4.09 |  | 812,094 |  | 6.7 |  | $ | 3.51 |  | 643,377 |  | $ | 3.48
﻿ | $ | 4.10 |  | $ | 13.09 |  | 598,462 |  | 5.0 |  | $ | 10.89 |  | 525,383 |  | $ | 11.42
﻿ | $ | 14.21 |  | $ | 35.00 |  | 619,599 |  | 2.8 |  | $ | 24.02 |  | 619,599 |  | $ | 24.02
﻿ | $ | 36.40 |  | $ | 53.55 |  | 127,661 |  | 0.7 |  | $ | 51.72 |  | 127,661 |  | $ | 51.72
﻿ |  |  |  |  |  |  | 2,817,504 |  | 5.6 |  | $ | 11.30 |  | 2,167,633 |  | $ | 13.86
﻿
Weighted Average Fair Value Of Options Granted |
﻿ |  |  |  |
﻿ |  | 2020 |  | 2019
﻿ | Volatility | 123% to 139% |  | 118% to 119%
﻿ | Risk-free interest rates | 0.46% to 0.78% |  | 1.7% to 2.5%
﻿ | Expected life of option | 7 years |  | 7 years
﻿ | Dividend yield | zero |  | zero
﻿ | Forfeiture rate | zero |  | zero
﻿ | Weighted average fair value of stock options granted | $6.69 |  | $1.60
﻿ |  |  |  |
﻿
Summary Of Performance Award Activity |
﻿ |  |
﻿ |  | Number of Performance Awards
﻿Outstanding as of December 31, 2019 |  | 138,055
﻿Granted |  | —
﻿Vested performance awards |  | —
﻿Forfeited/Canceled |  | —
﻿Outstanding as of December 31, 2020 |  | 138,055
﻿ |  |
﻿
Non-Cash Stock-Based Compensation Expenses |
﻿ |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |
﻿ |  | Year ended |
﻿ |  | December 31, |
﻿ |  | 2020 |  | 2019 |
﻿Research and development |  | $ | 453 |  | $ | 542 |
﻿ |  |  |  |  |  |  |
﻿General and administrative |  |  | 535 |  |  | 754 |
﻿ |  |  |  |  |  |  |
﻿Total non-cash stock-based compensation expense |  | $ | 988 |  | $ | 1,296 |
﻿ |  |  |  |  |  |  |
﻿

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- Definition Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of employee stock purchase plans, including, but not limited to: (a) expected term, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of warrants or rights issued. Warrants and rights outstanding are derivative securities that give the holder the right to purchase securities (usually equity) from the issuer at a specific price within a certain time frame. Warrants are often included in a new debt issue to entice investors by a higher return potential. The main difference between warrants and call options is that warrants are issued and guaranteed by the company, whereas options are exchange instruments and are not issued by the company. Also, the lifetime of a warrant is often measured in years, while the lifetime of a typical option is measured in months. Disclose the title of issue of securities called for by warrants and rights outstanding, the aggregate amount of securities called for by warrants and rights outstanding, the date from which the warrants or rights are exercisable, and the price at which the warrant or right is exercisable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6784392&loc=d3e188667-122775 + Details
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