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v3.22.2.2

Note 15 - Warrant Liabilities - Fair Value of Warrants (Details) $ in Thousands | Jun. 30, 2022 USD ($) yr | Mar. 31, 2022 USD ($) yr | Dec. 31, 2021 USD ($) yr | Jun. 30, 2021 USD ($) yr | Mar. 31, 2021 USD ($) yr | Feb. 18, 2021 USD ($) | Dec. 31, 2020 USD ($) yr
--- | --- | --- | --- | --- | --- | --- | ---
Proceeds allocated to warrant liabilities |  | $ 257 | $ 1,244 |  | $ 6,597 |  | $ 10,919 |  | $ 11,921 |  | $ 1,505 |
Investor Warrants Issued in Connection with 2021 Financing [Member] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds allocated to warrant liabilities |  | 167 | 626 | $ 964 | 3,257 |  | 5,942 | [1] | 10,476 |  |  |
Placement Agent Warrants Issued in Connection with 2021 Financing [Member] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds allocated to warrant liabilities |  | 22 | 84 | 132 | 431 | [1] | 817 | [1] | $ 1,445 | [1] |  |
Investor Warrants Issued in Connection with 2020 Financing [Member] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds allocated to warrant liabilities |  | 57 | 449 | 795 | 2,420 |  | 3,370 |  |  |  | 1,279 |
Placement Agent Warrants Issued in Connection with 2020 Financing [Member] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds allocated to warrant liabilities |  | $ 11 | $ 85 | $ 148 | 423 |  | 590 |  |  |  | 224 |
Investor Warrants Issued in Connection with 2018 Financing [Member] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds allocated to warrant liabilities | [2] |  |  |  | 66 |  |  |  |  |  |  |
Placement Agent Warrants Issued in Connection with 2018 Financing [Member] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds allocated to warrant liabilities |  |  |  |  | $ 66 |  | $ 200 | [2] |  |  | $ 2 | [2]
Measurement Input, Share Price [Member] | Investor Warrants Issued in Connection with 2021 Financing [Member] |  |  |  |  |  |  |  |  |  |  |  |
Fair value of the warrants |  | 0.34 | 0.73 | 1.00 | 2.00 |  | 2.64 | [1] | 4.48 |  |  |
Measurement Input, Share Price [Member] | Placement Agent Warrants Issued in Connection with 2021 Financing [Member] |  |  |  |  |  |  |  |  |  |  |  |
Fair value of the warrants |  | 0.34 | 0.73 | 1.00 | 2.00 | [1] | 2.64 | [1] | 4.48 | [1] |  |
Measurement Input, Share Price [Member] | Investor Warrants Issued in Connection with 2020 Financing [Member] |  |  |  |  |  |  |  |  |  |  |  |
Fair value of the warrants |  | 0.34 | 0.73 | 1.00 | 2.00 |  | 2.64 |  |  |  | 1.35 |
Measurement Input, Share Price [Member] | Placement Agent Warrants Issued in Connection with 2020 Financing [Member] |  |  |  |  |  |  |  |  |  |  |  |
Fair value of the warrants |  | 0.34 | 0.73 | 1.00 | 2.00 |  | 2.64 |  |  |  | 1.35 |
Measurement Input, Share Price [Member] | Investor Warrants Issued in Connection with 2018 Financing [Member] |  |  |  |  |  |  |  |  |  |  |  |
Fair value of the warrants | [2] |  |  |  | 2.00 |  |  |  |  |  |  |
Measurement Input, Share Price [Member] | Placement Agent Warrants Issued in Connection with 2018 Financing [Member] |  |  |  |  |  |  |  |  |  |  |  |
Fair value of the warrants | [2] |  |  |  |  |  | 2.64 |  |  |  | 1.35 |
Measurement Input, Expected Term [Member] | Investor Warrants Issued in Connection with 2021 Financing [Member] |  |  |  |  |  |  |  |  |  |  |  |
Fair value of the warrants |  | 2.13 | 2.38 | 2.63 | 3.14 |  | 3.38 | [1] | 3.50 |  |  |
Measurement Input, Expected Term [Member] | Placement Agent Warrants Issued in Connection with 2021 Financing [Member] |  |  |  |  |  |  |  |  |  |  |  |
Fair value of the warrants |  | 2.13 | 2.38 | 2.63 | 3.14 | [1] | 3.38 | [1] | 3.50 | [1] |  |
Measurement Input, Expected Term [Member] | Investor Warrants Issued in Connection with 2020 Financing [Member] |  |  |  |  |  |  |  |  |  |  |  |
Fair value of the warrants |  | 1.45 | 1.70 | 1.95 | 2.45 |  | 2.70 |  |  |  | 2.95 |
Measurement Input, Expected Term [Member] | Placement Agent Warrants Issued in Connection with 2020 Financing [Member] |  |  |  |  |  |  |  |  |  |  |  |
Fair value of the warrants |  | 1.45 | 1.70 | 1.95 | 2.45 |  | 2.70 |  |  |  | 2.95 |
Measurement Input, Expected Term [Member] | Investor Warrants Issued in Connection with 2018 Financing [Member] |  |  |  |  |  |  |  |  |  |  |  |
Fair value of the warrants | [2] |  |  |  | 0.05 |  |  |  |  |  |  |
Measurement Input, Expected Term [Member] | Placement Agent Warrants Issued in Connection with 2018 Financing [Member] |  |  |  |  |  |  |  |  |  |  |  |
Fair value of the warrants | [2] |  |  |  |  |  | 0.30 |  |  |  | 0.05 |
Measurement Input, Risk Free Interest Rate [Member] | Investor Warrants Issued in Connection with 2021 Financing [Member] |  |  |  |  |  |  |  |  |  |  |  |
Fair value of the warrants |  | 0.0297 | 0.0235 | 0.0087 | 0.0048 |  | 0.0041 | [1] | 0.0026 |  |  |
Measurement Input, Risk Free Interest Rate [Member] | Placement Agent Warrants Issued in Connection with 2021 Financing [Member] |  |  |  |  |  |  |  |  |  |  |  |
Fair value of the warrants |  | 0.0297 | 0.0235 | 0.0087 | 0.0048 | [1] | 0.0041 | [1] | 0.0026 | [1] |  |
Measurement Input, Risk Free Interest Rate [Member] | Investor Warrants Issued in Connection with 2020 Financing [Member] |  |  |  |  |  |  |  |  |  |  |  |
Fair value of the warrants |  | 0.0279 | 0.0223 | 0.0072 | 0.0034 |  | 0.0029 |  |  |  | 0.0017 |
Measurement Input, Risk Free Interest Rate [Member] | Placement Agent Warrants Issued in Connection with 2020 Financing [Member] |  |  |  |  |  |  |  |  |  |  |  |
Fair value of the warrants |  | 0.0279 | 0.0223 | 0.0072 | 0.0034 |  | 0.0029 |  |  |  | 0.0017 |
Measurement Input, Risk Free Interest Rate [Member] | Investor Warrants Issued in Connection with 2018 Financing [Member] |  |  |  |  |  |  |  |  |  |  |  |
Fair value of the warrants | [2] |  |  |  | 0.0004 |  |  |  |  |  |  |
Measurement Input, Risk Free Interest Rate [Member] | Placement Agent Warrants Issued in Connection with 2018 Financing [Member] |  |  |  |  |  |  |  |  |  |  |  |
Fair value of the warrants | [2] |  |  |  |  |  | 0.0003 |  |  |  | 0.0008 |
Measurement Input, Price Volatility [Member] | Investor Warrants Issued in Connection with 2021 Financing [Member] |  |  |  |  |  |  |  |  |  |  |  |
Fair value of the warrants |  | 1.24 | 1.21 | 1.15 | 1.14 |  | 1.68 | [1] | 1.68 |  |  |
Measurement Input, Price Volatility [Member] | Placement Agent Warrants Issued in Connection with 2021 Financing [Member] |  |  |  |  |  |  |  |  |  |  |  |
Fair value of the warrants |  | 1.24 | 1.21 | 1.15 | 1.14 | [1] | 1.68 | [1] | 1.68 | [1] |  |
Measurement Input, Price Volatility [Member] | Investor Warrants Issued in Connection with 2020 Financing [Member] |  |  |  |  |  |  |  |  |  |  |  |
Fair value of the warrants |  | 1.07 | 1.27 | 1.28 | 1.20 |  | 1.20 |  |  |  | 1.02 |
Measurement Input, Price Volatility [Member] | Placement Agent Warrants Issued in Connection with 2020 Financing [Member] |  |  |  |  |  |  |  |  |  |  |  |
Fair value of the warrants |  | 1.07 | 1.27 | 1.28 | 1.20 |  | 1.20 |  |  |  | 1.02 |
Measurement Input, Price Volatility [Member] | Investor Warrants Issued in Connection with 2018 Financing [Member] |  |  |  |  |  |  |  |  |  |  |  |
Fair value of the warrants | [2] |  |  |  | 0.74 |  |  |  |  |  |  |
Measurement Input, Price Volatility [Member] | Placement Agent Warrants Issued in Connection with 2018 Financing [Member] |  |  |  |  |  |  |  |  |  |  |  |
Fair value of the warrants | [2] |  |  |  |  |  | 2.06 |  |  |  | 0.59 |
Measurement Input, Exercise Price [Member] | Investor Warrants Issued in Connection with 2021 Financing [Member] |  |  |  |  |  |  |  |  |  |  |  |
Fair value of the warrants |  | 3.59 | 3.59 | 3.59 | 3.59 |  | 3.59 | [1] | 3.59 |  |  |
Measurement Input, Exercise Price [Member] | Placement Agent Warrants Issued in Connection with 2021 Financing [Member] |  |  |  |  |  |  |  |  |  |  |  |
Fair value of the warrants |  | 4.4875 | 4.4875 | 4.4875 | 4.4875 | [1] | 4.4875 | [1] | 4.4875 | [1] |  |
Measurement Input, Exercise Price [Member] | Investor Warrants Issued in Connection with 2020 Financing [Member] |  |  |  |  |  |  |  |  |  |  |  |
Fair value of the warrants |  | 2.03 | 2.03 | 2.03 | 2.03 |  | 2.03 |  |  |  | 2.03 |
Measurement Input, Exercise Price [Member] | Placement Agent Warrants Issued in Connection with 2020 Financing [Member] |  |  |  |  |  |  |  |  |  |  |  |
Fair value of the warrants |  | 2.03 | 2.03 | 2.03 | 2.03 |  | 2.03 |  |  |  | 2.03 |
Measurement Input, Exercise Price [Member] | Investor Warrants Issued in Connection with 2018 Financing [Member] |  |  |  |  |  |  |  |  |  |  |  |
Fair value of the warrants | [2] |  |  |  | 1.4927 |  |  |  |  |  |  |
Measurement Input, Exercise Price [Member] | Placement Agent Warrants Issued in Connection with 2018 Financing [Member] |  |  |  |  |  |  |  |  |  |  |  |
Fair value of the warrants | [2] |  |  |  |  |  | 1.4927 |  |  |  | 1.4927 |
Measurement Input, Quoted Price [Member] | Investor Warrants Issued in Connection with 2021 Financing [Member] |  |  |  |  |  |  |  |  |  |  |  |
Fair value of the warrants |  | 0.064 | 0.24 | 0.37 | 1.25 |  | 2.28 | [1] | 4.02 |  |  |
Measurement Input, Quoted Price [Member] | Placement Agent Warrants Issued in Connection with 2021 Financing [Member] |  |  |  |  |  |  |  |  |  |  |  |
Fair value of the warrants |  | 0.061 | 0.23 | 0.36 | 1.18 | [1] | 2.24 | [1] | 3.96 | [1] |  |
Measurement Input, Quoted Price [Member] | Investor Warrants Issued in Connection with 2020 Financing [Member] |  |  |  |  |  |  |  |  |  |  |  |
Fair value of the warrants |  | 0.033 | 0.26 | 0.46 | 1.40 |  | 1.95 |  |  |  | 0.74 |
Measurement Input, Quoted Price [Member] | Placement Agent Warrants Issued in Connection with 2020 Financing [Member] |  |  |  |  |  |  |  |  |  |  |  |
Fair value of the warrants |  | 0.036 | 0.28 | 0.49 | 1.40 |  | 1.95 |  |  |  | 0.74 |
Measurement Input, Quoted Price [Member] | Investor Warrants Issued in Connection with 2018 Financing [Member] |  |  |  |  |  |  |  |  |  |  |  |
Fair value of the warrants | [2] |  |  |  | 0.51 |  |  |  |  |  |  |
Measurement Input, Quoted Price [Member] | Placement Agent Warrants Issued in Connection with 2018 Financing [Member] |  |  |  |  |  |  |  |  |  |  |  |
Fair value of the warrants | [2] |  |  |  |  |  | 1.55 |  |  |  | 0.02 |
[1] | Closing date of the 2021 Financing.
[2] | The investor warrants issued in the 2018 Financing expired in July 2020. The placement agent warrants issued in the 2018 Financing were cashless exercised in July 2021.

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- Definition Value of outstanding derivative securities that permit the holder the right to purchase securities (usually equity) from the issuer at a specified price. + References No definition available. + Details
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- Definition Value of input used to measure outstanding warrant and right embodying unconditional obligation requiring redemption by transferring asset at specified or determinable date or upon event certain to occur. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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