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Note 13 - Equity-based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2023
Notes Tables |
Share-Based Payment Arrangement, Option, Activity [Table Text Block] |
(in thousands, except years and per share data) |  | Awards |  |  | Weighted- Average Exercise Price |  |  | Weighted- Average Remaining Contractual Life (years) |  |  | Aggregate Intrinsic Value |
Outstanding at December 31, 2022 |  |  | 132 |  |  | $ | 37.99 |  |  |  | 7.5 |  |  | $ | 69 |
Options granted |  |  | 42 |  |  | $ | 1.67 |  |  |  |  |  |  |  |  |
Restricted stock units granted |  |  | 5 |  |  |  | — |  |  |  |  |  |  |  |  |
Restricted stock units vested |  |  | (5 | ) |  |  | — |  |  |  |  |  |  |  |  |
Options forfeited/cancelled |  |  | (19 | ) |  | $ | 64.23 |  |  |  |  |  |  |  |  |
Restricted stock units cancelled |  |  | (7 | ) |  |  | — |  |  |  |  |  |  |  |  |
Outstanding at September 30, 2023 |  |  | 148 |  |  | $ | 26.26 |  |  |  | 7.6 |  |  | $ | 13 |
Vested and expected to vest at September 30, 2023 |  |  | 119 |  |  | $ | 32.34 |  |  |  | 7.5 |  |  | $ | 2 |
Vested at September 30, 2023 |  |  | 59 |  |  | $ | 59.30 |  |  |  | 5.8 |  |  | $ | — |
Exercisable at September 30, 2023 |  |  | 59 |  |  | $ | 59.30 |  |  |  | 5.8 |  |  | $ | — |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] |
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
|  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |
Research and development |  | $ | 5 |  |  | $ | 5 |  |  | $ | 16 |  |  | $ | 14 |
Sales and marketing |  |  | 18 |  |  |  | 12 |  |  |  | 49 |  |  |  | 37 |
General and administrative |  |  | 39 |  |  |  | (225 | ) |  |  | 136 |  |  |  | 79 |
Total stock-based compensation expense |  | $ | 62 |  |  | $ | (208 | ) |  | $ | 201 |  |  | $ | 130 |
Employees and Directors [Member] |
Notes Tables |
Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | Nine Months Ended September 30, |
Assumption |  | 2023 |  |  | 2022 |
Expected price volatility |  |  | 152.99 | % |  |  | 158.04 | %
Expected term (in years) |  |  | 6.81 |  |  |  | 6.45 |
Risk-free interest rate |  |  | 3.47 | % |  |  | 2.29 | %
Dividend yield |  |  | 0.00 | % |  |  | 0.00 | %
Weighted-average fair value of options granted during the period |  | $ | 1.61 |  |  | $ | 9.46 |

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- Definition Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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