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CONSOLIDATED BALANCE SHEETS (USD $)
Dec. 31, 2014
Dec. 31, 2013
Current Assets:    
Cash and cash equivalents $ 3,605,280us-gaap_CashAndCashEquivalentsAtCarryingValue $ 2,183,030us-gaap_CashAndCashEquivalentsAtCarryingValue
Short-term investments 1,944,547us-gaap_ShortTermInvestments   
Grants and accounts receivable, net of allowance for doubtful accounts of $3,756 and -0- at December 31, 2014 and 2013, respectively 819,151us-gaap_AccountsReceivableNet 453,017us-gaap_AccountsReceivableNet
Inventories 537,566us-gaap_InventoryNet 245,608us-gaap_InventoryNet
Prepaid expenses and other current assets 700,462us-gaap_PrepaidExpenseAndOtherAssetsCurrent 605,312us-gaap_PrepaidExpenseAndOtherAssetsCurrent
Total current assets 7,607,006us-gaap_AssetsCurrent 3,486,967us-gaap_AssetsCurrent
Property and equipment - net 245,821us-gaap_PropertyPlantAndEquipmentNet 144,393us-gaap_PropertyPlantAndEquipmentNet
Other assets 615,798us-gaap_OtherAssetsNoncurrent 414,375us-gaap_OtherAssetsNoncurrent
Total long-term assets 861,619us-gaap_AssetsNoncurrent 558,768us-gaap_AssetsNoncurrent
Total Assets 8,468,625us-gaap_Assets 4,045,735us-gaap_Assets
Current Liabilities:    
Accounts payable 698,307us-gaap_AccountsPayableCurrent 786,517us-gaap_AccountsPayableCurrent
Accrued expenses and other current liabilities 824,884ctso_AccruedExpensesAndOtherCurrentLiabilities 361,700ctso_AccruedExpensesAndOtherCurrentLiabilities
Deferred revenue 833us-gaap_DeferredRevenueCurrent 272,359us-gaap_DeferredRevenueCurrent
Warrant liability 2,981,418us-gaap_ProductWarrantyAccrualClassifiedCurrent   
Current portion of convertible notes payable, net of debt discount in the amount of $198,644 at December 31, 2013    1,644,356us-gaap_ConvertibleNotesPayableCurrent
Total current liabilities 4,505,442us-gaap_LiabilitiesCurrent 3,064,932us-gaap_LiabilitiesCurrent
Redeemable Series B Convertible Preferred Stock, -0- and 200,000 shares authorized; -0- and 79,336.54 issued and outstanding at December 31, 2014 and 2013, respectively    15,246,350ctso_PreferredStockValueNotIncludedInStockholdersEquity
Stockholders' Equity/(Deficiency):    
Common Stock, Par Value $0.001, 50,000,000 shares authorized; 23,304,640 and 10,052,782 shares issued and outstanding at December 31, 2014 and 2013, respectively 23,305us-gaap_CommonStockValue 10,053us-gaap_CommonStockValue
Additional paid-in capital 128,106,297us-gaap_AdditionalPaidInCapital 91,584,402us-gaap_AdditionalPaidInCapital
Accumulated other comprehensive income (loss) 227,701us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax (55,987)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Accumulated deficit (124,394,120)us-gaap_RetainedEarningsAccumulatedDeficit (105,805,775)us-gaap_RetainedEarningsAccumulatedDeficit
Total stockholders' equity/(deficiency) 3,963,183us-gaap_StockholdersEquity (14,265,547)us-gaap_StockholdersEquity
Total Liabilities and Stockholders' Equity/(Deficiency) 8,468,625us-gaap_LiabilitiesAndStockholdersEquity 4,045,735us-gaap_LiabilitiesAndStockholdersEquity
Series A Convertible Preferred Stock [Member]    
Stockholders' Equity/(Deficiency):    
Preferred Stock    1,760us-gaap_PreferredStockValue
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
Preferred Stock [Member]    
Stockholders' Equity/(Deficiency):    
Preferred Stock