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Stockholders’ Equity (Details Narrative) - USD ($) |  |  |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 19, 2023 | May 25, 2022 | Apr. 06, 2022 | Jan. 10, 2022 | Jun. 30, 2023 | Jun. 30, 2022 | Mar. 31, 2022 | Jun. 30, 2023 | Jun. 30, 2022 | Dec. 31, 2022 | Mar. 03, 2022 | Jan. 13, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Reverse stock split, description |  |  |  |  |  |  |  | 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. As of that date, each of the 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. |  |  |  |
Reverse stock split common stock outstanding |  |  |  |  |  |  |  | 5,770,467 |  |  |  |
Common stock, shares outstanding |  |  |  |  | 9,251,981 |  |  | 9,251,981 |  | 7,436,197 |  |
Stock issued during period, value, new issues |  |  |  |  | $ 198,562 | $ 6,339,369 |  | $ 2,672,924 | $ 6,339,369 |  |  |
Preferred stock, shares issued |  |  |  |  | 0 |  |  | 0 |  | 0 |  |
Preferred stock, stated value |  |  |  | $ 300 | $ 0.01 |  |  | $ 0.01 |  | $ 0.01 | $ 300 |
Proceeds from issuance of preferred stock |  |  |  | $ 28,500,000 |  |  |  |  |  |  |  |
Common stock, par value |  |  |  |  | $ 0.01 |  |  | $ 0.01 |  | $ 0.01 |  |
Redemption term description |  |  |  |  |  |  |  | Each holder of the Preferred Stock had the right to cause the Company to redeem all or part of their shares of the Preferred Stock from the earlier of receipt of stockholder approval of the Reverse Stock Split or of 90 days following the original issue date until 120 days following the original issue date, the “Redemption Date,” in cash at a redemption price equal to 105% of the stated value plus an amount equal to accumulated but unpaid dividends, if any, on such shares (whether or not earned or declared, but excluding interest on such dividends) up to, but excluding, the Redemption Date. |  |  |  |
Placement agent fees |  |  |  |  |  |  |  | $ 1,000,000 |  |  |  |
Preferred stock, shares outstanding |  |  |  |  | 0 |  |  | 0 |  | 0 |  |
Shares issued, redemption value |  |  |  |  |  |  |  |  |  |  |  |
Legal fees | $ 583,500 |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of common stock |  |  |  |  |  |  |  | $ 2,672,926 | 6,339,369 |  |  |
Series A Convertible Redeemable Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares issued |  |  |  | 50,000 |  |  |  |  |  |  |  |
Preferred stock, stated value |  |  |  | $ 0.01 |  |  |  |  |  |  |  |
Share price |  |  |  | $ 300 |  |  |  |  |  |  |  |
OriginalIssueDiscountRate |  |  |  | 5.00% |  |  |  |  |  |  |  |
Preferred stock, conversion price |  |  |  | $ 13.65 |  |  |  |  |  |  |  |
Conversion of stock, shares issued |  |  |  | 1,098,901 |  |  |  |  |  |  |  |
Common stock, par value |  |  |  | $ 13.65 |  |  |  |  |  |  |  |
Preferred stock, shares outstanding |  |  |  |  |  |  |  |  |  |  | 50,000 |
Series B Convertible Redeemable Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares issued |  |  |  | 50,000 |  |  |  |  |  |  |  |
Preferred stock, stated value |  |  |  | $ 0.01 |  |  |  |  |  |  |  |
Share price |  |  |  | $ 285 |  |  |  |  |  |  |  | $ 300
Proceeds from issuance of preferred stock |  |  |  | $ 14,250,000 |  |  |  |  |  |  |  |
Preferred stock, conversion price |  |  |  |  |  |  |  |  |  |  |  | $ 15.00
Conversion of stock, shares issued |  |  |  |  |  |  |  |  |  |  |  | 1,000,000
Common stock, par value |  |  |  | $ 15.00 |  |  |  |  |  |  |  |
Preferred stock, shares outstanding |  |  |  |  |  |  |  |  |  |  | 50,000 |
Series A & B Preferred [Member] |  |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest expense on preferred stock |  |  |  |  |  |  | $ 4,551,567 |  |  |  |  |
Shares issued, redemption value |  |  |  |  |  |  | 3,000,000 |  |  |  |  |
Proceeds from issuance under placement |  |  |  |  |  |  | 1,110,000 |  |  |  |  |
Legal fees |  |  |  |  |  |  | $ 441,567 |  |  |  |  |
Market Offering Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stock issued during period, value, new issues |  | $ 7,500,000 |  |  |  |  |  |  |  |  |  |
Number of shares sold |  |  |  |  |  |  |  | 1,815,584 |  | 336,075 |  |
Proceeds from sale of stock |  |  |  |  |  |  |  | $ 2,672,924 |  | $ 503,798 |  |
Preferred Stock Purchase Agreement [Member] | Series B Convertible Redeemable Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, voting rights |  |  |  | right to cast 3,000 votes per share of Series B Preferred Stock on the Reverse Stock Split. |  |  |  |  |  |  |  |
Securities Purchase Agreement [Member] | April 2022 Registered Direct Offering [Member] |  |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Share price |  |  | $ 5.27 |  |  |  |  |  |  |  |  |
Stock issued, shares |  |  | 1,328,274 |  |  |  |  |  |  |  |  |
Proceeds from issuance of common stock |  |  | $ 7,000,000.0 |  |  |  |  |  |  |  |  |
Placement agent fee description |  |  | In connection with the April 2022 Offering, the Company entered into a placement agent agreement with A.G.P./Alliance Global Partners (the “April 2022 Placement Agent”) pursuant to which the Company agreed to pay the April 2022 Placement Agent a cash fee equal to 6.5% of the aggregate gross proceeds raised from the sale of the securities sold in the April 2022 Offering and reimburse the April 2022 Placement Agent for certain of their expenses in an amount not to exceed $50,000. |  |  |  |  |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares outstanding |  |  |  |  | 6,600,000 |  |  | 6,600,000 |  |  |  |
Warrants issued |  |  |  |  | 2,500,000 |  |  | 2,500,000 |  |  |  |
Payments of stock issuance costs |  |  |  |  |  |  |  | $ 110,000 |  |  |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares outstanding |  |  |  |  | 400,000 |  |  | 400,000 |  |  |  |
Warrants issued |  |  |  |  | 200,000 |  |  | 200,000 |  |  |  |
Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Reverse stock split common stock outstanding |  |  |  |  |  |  |  | 86,557,736 |  |  |  |
Stock issued during period, value, new issues |  |  |  |  | $ 1,550 | $ 13,283 |  | $ 18,156 | 13,283 |  |  |
Shares issued, redemption value |  |  |  |  |  |  |  |  |  |  |  |
Stock issued, shares |  |  |  |  | 154,976 | 1,328,274 |  | 1,815,584 | 1,328,274 |  |  |

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