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Note 12 - Earn Out Milestone Liability (Details) (USD $)
 0 Months Ended 1 Months Ended 12 Months Ended
Dec. 31, 2014
Jun. 20, 2014
Dec. 31, 2014
Note 12 - Earn Out Milestone Liability (Details) [Line Items]      
Business Combination, Consideration Transferred, Liabilities Incurred     $ 13,878,204us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred
Gain (Loss) From Change in Fair Value of Earn-Out Milestone Liability     213,494clsn_GainLossFromChangeInFairValueOfEarnOutMilestoneLiability
EGEN, Inc. [Member] | Minimum [Member]      
Note 12 - Earn Out Milestone Liability (Details) [Line Items]      
Risk-Adjusted Assessment of Each Milestone 10.00%clsn_RiskAdjustedAssessmentOfEachMilestone
/ us-gaap_BusinessAcquisitionAxis
= clsn_EGENIncMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		 10.00%clsn_RiskAdjustedAssessmentOfEachMilestone
/ us-gaap_BusinessAcquisitionAxis
= clsn_EGENIncMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		 10.00%clsn_RiskAdjustedAssessmentOfEachMilestone
/ us-gaap_BusinessAcquisitionAxis
= clsn_EGENIncMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Estimated Time to Achieve the Milestone 1 year 73 days 1 year 6 months  
EGEN, Inc. [Member] | Maximum [Member]      
Note 12 - Earn Out Milestone Liability (Details) [Line Items]      
Risk-Adjusted Assessment of Each Milestone 67.00%clsn_RiskAdjustedAssessmentOfEachMilestone
/ us-gaap_BusinessAcquisitionAxis
= clsn_EGENIncMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		 67.00%clsn_RiskAdjustedAssessmentOfEachMilestone
/ us-gaap_BusinessAcquisitionAxis
= clsn_EGENIncMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		 67.00%clsn_RiskAdjustedAssessmentOfEachMilestone
/ us-gaap_BusinessAcquisitionAxis
= clsn_EGENIncMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Estimated Time to Achieve the Milestone 6 years 6 months 7 years  
EGEN, Inc. [Member]      
Note 12 - Earn Out Milestone Liability (Details) [Line Items]      
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High 30,400,000us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh
/ us-gaap_BusinessAcquisitionAxis
= clsn_EGENIncMember		   30,400,000us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh
/ us-gaap_BusinessAcquisitionAxis
= clsn_EGENIncMember
Business Combination, Consideration Transferred, Liabilities Incurred 13,700,000us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred
/ us-gaap_BusinessAcquisitionAxis
= clsn_EGENIncMember		 13,900,000us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred
/ us-gaap_BusinessAcquisitionAxis
= clsn_EGENIncMember		 13,878,000us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred
/ us-gaap_BusinessAcquisitionAxis
= clsn_EGENIncMember		 [1]
Gain (Loss) From Change in Fair Value of Earn-Out Milestone Liability $ 231,949clsn_GainLossFromChangeInFairValueOfEarnOutMilestoneLiability
/ us-gaap_BusinessAcquisitionAxis
= clsn_EGENIncMember		    
[1] The total aggregate purchase price for the Egen Acquisition included potential future Earn-Out Payments contingent upon achievement of certain milestones. The difference between the aggregate $30.4 million in future Earn-Out Payments and the $13.9 million included in the fair value of the acquisition consideration at June 20, 2014 was based on the Company's risk-adjusted assessment of each milestone and utilizing a discount rate based on the estimated time to achieve the milestone. These milestone payments will be fair valued at the end of each quarter and any change in their value will be recognized in the financial statement. As of December 31, 2014, the Company fair valued these milestones at $13.7 million and recognized a gain of $231,949 as a result of the change in the fair value of these milestones from June 30, 2014.