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Condensed Consolidated Balance Sheets (USD $)
Mar. 31, 2015
Dec. 31, 2014
Current assets:    
Cash and cash equivalents $ 86,004,445us-gaap_CashAndCashEquivalentsAtCarryingValue $ 55,713,784us-gaap_CashAndCashEquivalentsAtCarryingValue
Short-term investment securities 19,131,437us-gaap_ShortTermInvestments 23,062,034us-gaap_ShortTermInvestments
Interest receivable 89,710us-gaap_InterestReceivableCurrent 85,516us-gaap_InterestReceivableCurrent
Prepaid research and development 9,810,887tgtx_PrepaidResearchAndDevelopment 6,179,743tgtx_PrepaidResearchAndDevelopment
Other current assets 701,862us-gaap_OtherAssetsCurrent 173,952us-gaap_OtherAssetsCurrent
Total current assets 115,738,341us-gaap_AssetsCurrent 85,215,029us-gaap_AssetsCurrent
Restricted cash 576,072us-gaap_RestrictedCashAndCashEquivalentsNoncurrent 575,012us-gaap_RestrictedCashAndCashEquivalentsNoncurrent
Equipment, net 24,821us-gaap_PropertyPlantAndEquipmentNet 20,357us-gaap_PropertyPlantAndEquipmentNet
Goodwill 799,391us-gaap_Goodwill 799,391us-gaap_Goodwill
Other assets 130,626us-gaap_OtherAssetsNoncurrent 137,101us-gaap_OtherAssetsNoncurrent
Total assets 117,269,251us-gaap_Assets 86,746,890us-gaap_Assets
Current liabilities:    
Notes payable, current portion 272,206us-gaap_NotesPayableCurrent 275,190us-gaap_NotesPayableCurrent
Accounts payable and accrued expenses 8,880,438us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent 3,991,625us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent
Accrued compensation 248,000us-gaap_DeferredCompensationLiabilityCurrent 702,000us-gaap_DeferredCompensationLiabilityCurrent
Current portion of deferred revenue 152,381us-gaap_DeferredRevenueCurrent 152,381us-gaap_DeferredRevenueCurrent
Total current liabilities 9,553,025us-gaap_LiabilitiesCurrent 5,121,196us-gaap_LiabilitiesCurrent
Deferred revenue, net of current portion 1,485,714us-gaap_DeferredRevenueNoncurrent 1,523,810us-gaap_DeferredRevenueNoncurrent
Total liabilities 11,038,739us-gaap_Liabilities 6,645,006us-gaap_Liabilities
Commitments and contingencies      
Equity:    
Preferred stock, $0.001 par value per share (10,000,000 shares authorized, none issued and outstanding as of March 31, 2015 and December 31, 2014) 0us-gaap_PreferredStockValue 0us-gaap_PreferredStockValue
Common stock, $0.001 par value per share (150,000,000 shares authorized, 47,471,904 and 44,974,248 shares issued, 47,430,595 and 44,932,939 shares outstanding at March 31, 2015 and December 31, 2014, respectively) 47,472us-gaap_CommonStockValue 44,974us-gaap_CommonStockValue
Contingently issuable shares 6tgtx_ContingentlyIssuableShares 6tgtx_ContingentlyIssuableShares
Additional paid-in capital 216,180,386us-gaap_AdditionalPaidInCapital 175,476,521us-gaap_AdditionalPaidInCapital
Treasury stock, at cost, 41,309 shares at March 31, 2015 and December 31, 2014 (234,337)us-gaap_TreasuryStockValue (234,337)us-gaap_TreasuryStockValue
Accumulated deficit (109,763,015)us-gaap_RetainedEarningsAccumulatedDeficit (95,185,280)us-gaap_RetainedEarningsAccumulatedDeficit
Total equity 106,230,512us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest 80,101,884us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
Total liabilities and equity $ 117,269,251us-gaap_LiabilitiesAndStockholdersEquity $ 86,746,890us-gaap_LiabilitiesAndStockholdersEquity