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Note 10 - Stockholders' Equity (Details) - Assumptions for Valuation of Waived Warrants Associated with Common Stock Offering
 1 Months Ended 5 Months Ended 12 Months Ended
Oct. 28, 2013
Jun. 03, 2013
Dec. 31, 2014
Note 10 - Stockholders' Equity (Details) - Assumptions for Valuation of Waived Warrants Associated with Common Stock Offering [Line Items]      
Risk-free interest rate     0.78%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
Expected volatility     102.23%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
Expected life (in years)     5 years
Expected forfeiture rate 0.00%clsn_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedForfeitureRate 0.00%clsn_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedForfeitureRate 0.00%clsn_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedForfeitureRate
Expected dividend yield 0.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate 0.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate 0.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
Waived Warrants [Member] | Minimum [Member]      
Note 10 - Stockholders' Equity (Details) - Assumptions for Valuation of Waived Warrants Associated with Common Stock Offering [Line Items]      
Risk-free interest rate 0.59%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_FinancialInstrumentAxis
= clsn_WaivedWarrantsMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		 0.50%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_FinancialInstrumentAxis
= clsn_WaivedWarrantsMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		  
Expected volatility 105.10%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_FinancialInstrumentAxis
= clsn_WaivedWarrantsMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		 102.90%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_FinancialInstrumentAxis
= clsn_WaivedWarrantsMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		  
Expected life (in years) 2 years 255 days 3 years 36 days  
Waived Warrants [Member] | Maximum [Member]      
Note 10 - Stockholders' Equity (Details) - Assumptions for Valuation of Waived Warrants Associated with Common Stock Offering [Line Items]      
Risk-free interest rate 1.31%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_FinancialInstrumentAxis
= clsn_WaivedWarrantsMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		 1.03%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_FinancialInstrumentAxis
= clsn_WaivedWarrantsMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		  
Expected volatility 111.80%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_FinancialInstrumentAxis
= clsn_WaivedWarrantsMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		 110.90%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_FinancialInstrumentAxis
= clsn_WaivedWarrantsMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		  
Expected life (in years) 4 years 109 days 4 years 255 days