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Consolidated Balance Sheets (USD $)
Dec. 31, 2014
Dec. 31, 2013
Current assets:    
Cash and cash equivalents $ 12,686,881us-gaap_CashAndCashEquivalentsAtCarryingValue $ 5,718,504us-gaap_CashAndCashEquivalentsAtCarryingValue
Investment securities – available for sale, at fair value 24,173,406us-gaap_ShortTermInvestments 37,156,381us-gaap_ShortTermInvestments
Accrued interest receivable on investment securities 210,030us-gaap_AccruedInvestmentIncomeReceivable 212,048us-gaap_AccruedInvestmentIncomeReceivable
Advances and deposits on clinical programs 200,821us-gaap_GrantsReceivableCurrent 111,635us-gaap_GrantsReceivableCurrent
Other current assets 235,133us-gaap_PrepaidExpenseAndOtherAssetsCurrent 563,551us-gaap_PrepaidExpenseAndOtherAssetsCurrent
37,506,271us-gaap_AssetsCurrent 43,762,119us-gaap_AssetsCurrent
Property and equipment (at cost, less accumulated depreciation and amortization of $1,633,517 and $1,264,190, respectively) 1,170,497us-gaap_PropertyPlantAndEquipmentNet 832,886us-gaap_PropertyPlantAndEquipmentNet
Other assets:    
Goodwill 1,976,101us-gaap_Goodwill  
Security deposit on letter of credit 150,000us-gaap_SecurityDeposit 200,000us-gaap_SecurityDeposit
Deferred financing fees 68,049us-gaap_DeferredFinanceCostsNoncurrentNet 844,249us-gaap_DeferredFinanceCostsNoncurrentNet
Other assets 21,886us-gaap_DepositsAssetsNoncurrent 31,318us-gaap_DepositsAssetsNoncurrent
28,017,764us-gaap_AssetsNoncurrent 1,075,567us-gaap_AssetsNoncurrent
Total assets 66,694,532us-gaap_Assets 45,670,572us-gaap_Assets
Current liabilities:    
Accounts payable ─ trade 3,480,225us-gaap_AccountsPayableCurrent 1,452,436us-gaap_AccountsPayableCurrent
Other accrued liabilities 2,456,365us-gaap_AccruedLiabilitiesCurrent 2,707,653us-gaap_AccruedLiabilitiesCurrent
Notes payable - current portion 3,654,231us-gaap_NotesPayableCurrent 10,891us-gaap_NotesPayableCurrent
Deferred revenue – current portion 500,000us-gaap_DeferredRevenueCurrent 500,000us-gaap_DeferredRevenueCurrent
Total current liabilities 10,090,821us-gaap_LiabilitiesCurrent 4,670,980us-gaap_LiabilitiesCurrent
Earn-Out milestone liability 13,663,710us-gaap_BusinessCombinationContingentConsiderationLiabilityNoncurrent  
Common stock warrant liability 275,008clsn_CommonStockWarrantLiability 3,026clsn_CommonStockWarrantLiability
Note payable – non-current portion 6,053,065us-gaap_LongTermNotesPayable 5,000,000us-gaap_LongTermNotesPayable
Deferred revenue – non-current portion 3,500,000us-gaap_DeferredRevenueNoncurrent 4,000,000us-gaap_DeferredRevenueNoncurrent
Other liabilities – noncurrent 286,592us-gaap_OtherLiabilitiesNoncurrent 472,731us-gaap_OtherLiabilitiesNoncurrent
Total liabilities 33,869,196us-gaap_Liabilities 14,146,737us-gaap_Liabilities
Commitments and contingencies 0us-gaap_CommitmentsAndContingencies 0us-gaap_CommitmentsAndContingencies
Stockholders’ equity:    
Preferred Stock - $0.01 par value (100,000 shares authorized and no shares issued or outstanding at December 31, 2014 and 2013, respectively) 0us-gaap_PreferredStockValue 0us-gaap_PreferredStockValue
Common stock - $0.01 par value (75,000,000 shares authorized; 20,097,603 and 13,737,970 shares issued at December 31, 2014 and 2013 and 19,984,203 and 13,604,975 shares outstanding at December 31, 2014 and 2013, respectively) 200,976us-gaap_CommonStockValue 137,380us-gaap_CommonStockValue
Additional paid-in capital 229,778,703us-gaap_AdditionalPaidInCapitalCommonStock 203,139,142us-gaap_AdditionalPaidInCapitalCommonStock
Accumulated other comprehensive loss (16,032)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax (44,166)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Accumulated deficit (195,073,702)us-gaap_RetainedEarningsAccumulatedDeficit (169,287,157)us-gaap_RetainedEarningsAccumulatedDeficit
34,889,945us-gaap_StockholdersEquityBeforeTreasuryStock 33,945,199us-gaap_StockholdersEquityBeforeTreasuryStock
Treasury stock, at cost (113,400 and 132,995 shares at December 31, 2014 and 2013, respectively) (2,064,609)us-gaap_TreasuryStockValue (2,421,364)us-gaap_TreasuryStockValue
Total stockholders’ equity 32,825,336us-gaap_StockholdersEquity 31,523,835us-gaap_StockholdersEquity
Total liabilities and stockholders’ equity 66,694,532us-gaap_LiabilitiesAndStockholdersEquity 45,670,572us-gaap_LiabilitiesAndStockholdersEquity
In Process Research and Development [Member]    
Other assets:    
In-process research and development $ 25,801,728us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_InProcessResearchAndDevelopmentMember