v3.23.1

Note 1 - Nature of Operations (Details Textual) - USD ($) $ / shares in Units, $ in Thousands |  |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 15, 2021 | Jun. 17, 2020 | Nov. 30, 2022 | Feb. 28, 2021 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 09, 2020 | Jun. 16, 2020
Retained Earnings (Accumulated Deficit), Total |  |  |  |  | $ (224,105) | $ (180,405) |  |
Proceeds from Issuance of Common Stock |  |  |  |  | $ 2,135 | $ 0 |  |
Common Stock, Par or Stated Value Per Share (in dollars per share) |  |  |  |  | $ 0.0001 | $ 0.0001 | $ 0.0001 |
Proceeds from Issuance of Private Placement | $ 16,740 |  |  |  |  |  |  |
Proceeds from Warrant Exercises |  |  |  |  | $ 0 | $ 903 |  |
Venus Spain [Member] | Employee Severance and Retention [Member] |  |  |  |  |  |  |  |
Restructuring Charges, Total |  |  |  |  | $ 102 |  |  |
December 2020 Public Offering Warrants [Member] |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercised During Period (in shares) |  |  |  | 361,200 |  |  |  |
Class of Warrant or Right, Exercised During Period, Exercise Price (in dollars per share) |  |  |  | $ 2.50 |  |  |  |
Proceeds from Warrant Exercises |  |  |  | $ 903 |  |  |  |
Series A Preferred Stock [Member] |  |  |  |  |  |  |  |
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ 0.0001 |  |  |  |  |  |  |
Proceeds from Issuance of Private Placement | $ 4,514 |  |  |  |  |  |  |
Common Stock [Member] |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  |  |  |  | 7,585,529 |  |  |
Proceeds from Issuance of Private Placement | 12,074 |  |  |  |  |  |  |
Equity Purchase Agreement [Member] | Lincoln Park [Member] |  |  |  |  |  |  |  |
Equity Purchase Agreement, Maximum Offering Amount |  |  |  |  |  |  |  | $ 31,000
Agreement Term (Year) |  |  |  |  |  |  |  | 2 years
Proceeds from Issuance of Common Stock |  |  |  |  | $ 272 |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  | 3,437,087 |  |  | 400,000 |  |  |
Common Stock, Par or Stated Value Per Share (in dollars per share) |  |  |  |  |  |  |  | $ 0.0001
The 2021 Private Placement [Member] |  |  |  |  |  |  |  |
Proceeds from Issuance of Private Placement | $ 16,999 |  |  |  | $ 0 | $ 16,740 |  |
The 2021 Private Placement [Member] | Series A Preferred Stock [Member] |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) | 3,790,755 |  |  |  |  |  |  |
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ 0.0001 |  |  |  |  |  |  |
The 2021 Private Placement [Member] | Common Stock [Member] |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) | 9,808,418 |  |  |  |  |  |  |
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ 0.0001 |  |  |  |  | $ 0.0001 |  |
The 2022 Private Placement [Member] |  |  |  |  |  |  |  |
Proceeds from Issuance of Private Placement |  |  | $ 6,720 |  | $ 6,518 | $ 0 |  |
The 2022 Private Placement [Member] | Series A Preferred Stock [Member] |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  |  | 3,185,000 |  |  |  |  |
Preferred Stock, Par or Stated Value Per Share (in dollars per share) |  |  | $ 0.0001 |  |  |  |  |
The 2022 Private Placement [Member] | Common Stock [Member] |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  |  | 1,750,000 |  |  |  |  |
Common Stock, Par or Stated Value Per Share (in dollars per share) |  |  | $ 0.0001 |  |  |  |  |

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