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Net Loss Per Common Share (Details Narrative) - shares | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Jun. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Earnings Per Share [Abstract] |  |  |  |
Number of shares of common stock issuable upon exercise of warrants and equity awards | 6,496,261 | 6,208,389 | 6,496,261 | 6,208,389

X
- Definition Represents the total number of Shares of common stock issuable upon exercise of warrants and equity awards. + References No definition available. + Details
Name: | CLSN_NumberOfSharesOfCommonStockIssuableUponExerciseOfWarrantsAndEquityAwards
Namespace Prefix: | CLSN_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_EarningsPerShareAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration