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Consolidated Balance Sheets (USD $)
Dec. 31, 2014
Dec. 31, 2013
Current assets    
Cash and cash equivalents $ 6,581,000us-gaap_CashAndCashEquivalentsAtCarryingValue $ 20,355,000us-gaap_CashAndCashEquivalentsAtCarryingValue
Accounts receivable 100,000us-gaap_AccountsReceivableNetCurrent 8,000us-gaap_AccountsReceivableNetCurrent
Prepaid expenses and other current assets 339,000us-gaap_PrepaidExpenseAndOtherAssetsCurrent 297,000us-gaap_PrepaidExpenseAndOtherAssetsCurrent
Total current assets 7,020,000us-gaap_AssetsCurrent 20,660,000us-gaap_AssetsCurrent
Property and equipment, net 1,220,000us-gaap_PropertyPlantAndEquipmentNet 145,000us-gaap_PropertyPlantAndEquipmentNet
In process research and development 12,446,000us-gaap_IntangibleAssetsNetExcludingGoodwill 12,446,000us-gaap_IntangibleAssetsNetExcludingGoodwill
Acquired patents, net 369,000us-gaap_FiniteLivedPatentsGross 400,000us-gaap_FiniteLivedPatentsGross
Goodwill 7,562,000us-gaap_Goodwill 7,562,000us-gaap_Goodwill
Total assets 28,617,000us-gaap_Assets 41,213,000us-gaap_Assets
Current liabilities    
Accounts payable and accrued expenses 1,167,000us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent 2,147,000us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent
Deferred revenue 244,000us-gaap_DeferredRevenueCurrent 244,000us-gaap_DeferredRevenueCurrent
Accrued severance 457,000us-gaap_EmployeeRelatedLiabilitiesCurrent 0us-gaap_EmployeeRelatedLiabilitiesCurrent
Total current liabilities 1,868,000us-gaap_LiabilitiesCurrent 2,391,000us-gaap_LiabilitiesCurrent
Preferred B stock conversion liability 12,320,000aphb_PrefferedBStockConversionLiability 40,791,000aphb_PrefferedBStockConversionLiability
Warrant liability 5,826,000us-gaap_WarrantsAndRightsOutstanding 16,871,000us-gaap_WarrantsAndRightsOutstanding
Accrued severance 98,000aphb_EmployeeRelatedLiabilitiesNoncurrent 0aphb_EmployeeRelatedLiabilitiesNoncurrent
Deferred tax liability 3,078,000us-gaap_DeferredTaxLiabilitiesNoncurrent 3,078,000us-gaap_DeferredTaxLiabilitiesNoncurrent
Total liabilities 23,190,000us-gaap_Liabilities 63,131,000us-gaap_Liabilities
Series B redeemable convertible preferred stock    
Preferred stock, $0.01 par value, 10,000,000 shares authorized, 8,671,040 shares issued and outstanding at December 31, 2014 and 8,859,978 shares issued and outstanding at December 31, 2013 (liquidation preference of $14,042,000 and $13,022,000 at December 31, 2014 and December 31, 2013, respectively) 1,990,000us-gaap_TemporaryEquityValueExcludingAdditionalPaidInCapital 707,000us-gaap_TemporaryEquityValueExcludingAdditionalPaidInCapital
Stockholders' equity (deficit)    
Common stock, $0.01 par value, 445,000,000 shares authorized, 199,159,093 shares issued and outstanding at December 31, 2014 and 182,535,562 shares issued and outstanding at December 31, 2013 1,992,000us-gaap_CommonStockValue 1,825,000us-gaap_CommonStockValue
Additional paid-in capital 363,451,000us-gaap_AdditionalPaidInCapital 358,828,000us-gaap_AdditionalPaidInCapital
Paid-in-capital - contingent shares 0us-gaap_OtherAdditionalCapital 1,837,000us-gaap_OtherAdditionalCapital
Accumulated deficit (362,006,000)us-gaap_RetainedEarningsAccumulatedDeficit (385,115,000)us-gaap_RetainedEarningsAccumulatedDeficit
Total stockholders’ equity (deficit) 3,437,000us-gaap_StockholdersEquity (22,625,000)us-gaap_StockholdersEquity
Total liabilities, Series B redeemable convertible preferred stock and stockholders’ equity (deficit) $ 28,617,000us-gaap_LiabilitiesAndStockholdersEquity $ 41,213,000us-gaap_LiabilitiesAndStockholdersEquity