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Note 15 - Equity-based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2022
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, 2021 |  |  | 4,449 |  |  | $ | 1.39 |  |  |  | 7.6 |  |  | $ | 460 |
Options granted |  |  | 626 |  |  | $ | 0.28 |  |  |  |  |  |  |  |  |
Restricted stock units granted |  |  | 180 |  |  | $ | — |  |  |  |  |  |  |  |  |
Restricted stock units vested |  |  | (120 | ) |  | $ | — |  |  |  |  |  |  |  |  |
Options forfeited/cancelled |  |  | (362 | ) |  | $ | 3.50 |  |  |  |  |  |  |  |  |
Restricted stock units cancelled |  |  | (30 | ) |  | $ | — |  |  |  |  |  |  |  |  |
Outstanding at September 30, 2022 |  |  | 4,743 |  |  | $ | 1.07 |  |  |  | 7.8 |  |  | $ | 135 |
Vested and expected to vest at September 30, 2022 |  |  | 3,492 |  |  | $ | 1.42 |  |  |  | 7.4 |  |  | $ | 20 |
Vested at September 30, 2022 |  |  | 2,068 |  |  | $ | 2.06 |  |  |  | 6.3 |  |  | $ | — |
Exercisable at September 30, 2022 |  |  | 2,068 |  |  | $ | 2.06 |  |  |  | 6.3 |  |  | $ | — |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] |
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
|  | 2022 |  |  | 2021 |  |  | 2022 |  |  | 2021 |
Research and development |  | $ | 5 |  |  | $ | 2 |  |  | $ | 14 |  |  | $ | 8 |
Sales and marketing |  |  | 12 |  |  |  | 53 |  |  |  | 37 |  |  |  | 118 |
General and administrative |  |  | (225 | ) |  |  | 169 |  |  |  | 79 |  |  |  | 576 |
Total stock-based compensation expense |  | $ | (208 | ) |  | $ | 224 |  |  | $ | 130 |  |  | $ | 702 |
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 |  | 2022 |  |  | 2021 |
Expected price volatility |  |  | 158.04 | % |  |  | 163.95 | %
Expected term (in years) |  |  | 6.45 |  |  |  | 6.19 |
Risk-free interest rate |  |  | 2.29 | % |  |  | 0.92 | %
Dividend yield |  |  | 0.00 | % |  |  | 0.00 | %
Weighted-average fair value of options granted during the period |  | $ | 0.27 |  |  | $ | 0.71 |

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + 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 (d) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI https://asc.fasb.org/extlink&oid=128089324&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 stock options, including, but not limited to: (a) expected term of share options and similar instruments, (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 https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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