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Note 15 - Equity-based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2021
Notes Tables |
Share-based Payment Arrangement, Option, Activity [Table Text Block] |
(in thousands, except years and per share data) |  | Options |  |  | Weighted- Average Exercise Price |  |  | Weighted- Average Remaining Contractual Life (years) |  |  | Aggregate Intrinsic Value |
Outstanding at December 31, 2020 |  |  | 3,165 |  |  | $ | 2.05 |  |  |  | 7.6 |  |  | $ | 189 |
Options granted |  |  | 516 |  |  | $ | 0.66 |  |  |  |  |  |  |  |  |
Restricted stock units granted |  |  | 1,528 |  |  | $ | — |  |  |  |  |  |  |  |  |
Restricted stock units vested |  |  | (488 | ) |  | $ | — |  |  |  |  |  |  |  |  |
Options forfeited/cancelled |  |  | (272 | ) |  | $ | 2.35 |  |  |  |  |  |  |  |  |
Outstanding at December 31, 2021 |  |  | 4,449 |  |  | $ | 1.39 |  |  |  | 7.6 |  |  | $ | 460 |
Vested and expected to vest at December 31, 2021 |  |  | 4,125 |  |  | $ | 1.46 |  |  |  | 7.5 |  |  | $ | 406 |
Vested at December 31, 2021 |  |  | 2,150 |  |  | $ | 2.42 |  |  |  | 5.4 |  |  | $ | 8 |
Exercisable at December 31, 2021 |  |  | 2,150 |  |  | $ | 2.42 |  |  |  | 5.9 |  |  | $ | 8 |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] |
|  | Year Ended December 31, |
|  | 2021 |  |  | 2020 |  |  | 2019 |
Research and development |  | $ | 10 |  |  | $ | 23 |  |  | $ | 42 |
Sales and marketing |  |  | 129 |  |  |  | 85 |  |  |  | 93 |
General and administrative |  |  | 794 |  |  |  | 424 |  |  |  | 351 |
Total stock-based compensation expense |  | $ | 933 |  |  | $ | 532 |  |  | $ | 486 |
Nonemployees [Member] |
Notes Tables |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | Year Ended December 31, |
Assumptions |  | 2021 |  |  | 2020 |
Expected price volatility |  |  | — |  |  |  | 162 | %
Expected term (in years) |  |  | — |  |  |  | 6.34 |
Risk-free interest rate |  |  | — |  |  |  | 0.50 | %
Dividend yield |  |  | — |  |  |  | 0.00 | %
Weighted-average fair value of options granted during the period |  | $ | — |  |  | $ | 0.73 |
Employees and Directors [Member] |
Notes Tables |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | Year Ended December 31, |
Assumptions |  | 2021 |  |  | 2020 |  |  | 2019 |
Expected price volatility |  |  | 164 | % |  |  | 161 | % |  |  | 112 | %
Expected term (in years) |  |  | 6.19 |  |  |  | 6.45 |  |  |  | 6.14 |
Risk-free interest rate |  |  | 1.05 | % |  |  | 0.45 | % |  |  | 1.99 | %
Dividend yield |  |  | 0.00 | % |  |  | 0.00 | % |  |  | 0.00 | %
Weighted-average fair value of options granted during the period |  | $ | 0.64 |  |  | $ | 0.94 |  |  | $ | 0.31 |

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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 http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=122041274&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901 + 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 http://asc.fasb.org/extlink&oid=120381028&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 http://asc.fasb.org/extlink&oid=120381028&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 http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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