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SUBSEQUENT EVENTS (Details Narrative) - USD ($) |  |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Feb. 28, 2022 | Jan. 10, 2022 | Dec. 31, 2021 | Mar. 03, 2022 | Jan. 31, 2022 | Dec. 31, 2020
Subsequent Event [Line Items] |  |  |  |  |  |
Preferred Stock, Shares Issued |  |  | 0 |  |  | 0
Preferred Stock, Par or Stated Value Per Share |  |  | $ 0.01 |  |  | $ 0.01
Preferred Stock Value |  |  |  |  |  |
Preferred Stock Shares Outstanding |  |  | 0 |  |  | 0
Reverse Stock Split |  |  | On February 28, 2022, the Company effected a 15-for-1 reverse stock split of its common stock which was made effective for trading purposes as of the commencement of trading on March 31, 2022. As of that date, each 15 shares of issued and outstanding common stock and equivalents was consolidated into one share of common stock. All shares have been restated to reflect the effects of the 15-for-1 reverse stock split. In addition, at the market open on March 1, 2022, the Company’s common stock started trading under a new CUSIP number 15117N602 although the Company’s ticker symbol, CLSN, remained unchanged. |  |  |
Common stock, shares issued |  |  | 5,770,538 |  |  | 2,713,424
Common Stock Shares Outstanding |  |  | 5,770,516 |  |  | 2,713,402
Subsequent Event [Member] |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Investment |  |  |  |  | $ 250,000 |
Preferred Stock, Par or Stated Value Per Share |  | $ 300 |  |  |  |
Share Price |  | $ 285 |  |  |  |
Proceeds from Issuance of Preferred Stock and Preference Stock |  | $ 14,250,000 |  |  |  |
Preferred Stock Value |  |  |  | $ 300 |  |
Reverse Stock Split | On February 28, 2022, the Company effected a 15-for-1 reverse stock split of its common stock which was made effective for trading purposes as of the commencement of trading on March 1, 2022. |  |  |  |  |
Common stock, shares issued | 15 |  |  |  |  |
Common Stock Shares Outstanding | 15 |  |  |  |  |
Subsequent Event [Member] | Series A Convertible Redeemable Preferred Stock [Member] |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Preferred Stock, Shares Issued |  | 50,000 |  |  |  |
Preferred Stock, Par or Stated Value Per Share |  | $ 0.01 |  |  |  |
Share Price |  | 300 |  |  |  |
Preferred Stock, Convertible, Conversion Price |  | $ 13.65 |  |  |  |
Convertible Preferred Stock, Shares Issued upon Conversion |  | 1,098,901 |  |  |  |
Preferred Stock Shares Outstanding |  |  |  | 50,000 |  |
Subsequent Event [Member] | Series B Convertible Redeemable Preferred Stock [Member] |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Preferred Stock, Shares Issued |  | 50,000 |  |  |  |
Preferred Stock, Par or Stated Value Per Share |  | $ 0.01 |  |  |  |
Share Price |  | 300 |  |  |  |
Preferred Stock, Convertible, Conversion Price |  | $ 15.00 |  |  |  |
Convertible Preferred Stock, Shares Issued upon Conversion |  | 1,000,000 |  |  |  |
Preferred Stock Shares Outstanding |  |  |  | 50,000 |  |

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