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Consolidated Balance Sheets (USD $)
Mar. 31, 2015
Dec. 31, 2014
Current assets    
Cash and cash equivalents $ 16,625,000us-gaap_CashAndCashEquivalentsAtCarryingValue $ 6,581,000us-gaap_CashAndCashEquivalentsAtCarryingValue
Accounts receivable 0us-gaap_AccountsReceivableNetCurrent 100,000us-gaap_AccountsReceivableNetCurrent
Prepaid expenses and other current assets 413,000us-gaap_PrepaidExpenseAndOtherAssetsCurrent 339,000us-gaap_PrepaidExpenseAndOtherAssetsCurrent
Total current assets 17,038,000us-gaap_AssetsCurrent 7,020,000us-gaap_AssetsCurrent
Property and equipment, net 1,197,000us-gaap_PropertyPlantAndEquipmentNet 1,220,000us-gaap_PropertyPlantAndEquipmentNet
In process research and development 12,446,000us-gaap_IntangibleAssetsNetExcludingGoodwill 12,446,000us-gaap_IntangibleAssetsNetExcludingGoodwill
Acquired patents, net 361,000us-gaap_FiniteLivedPatentsGross 369,000us-gaap_FiniteLivedPatentsGross
Goodwill 7,562,000us-gaap_Goodwill 7,562,000us-gaap_Goodwill
Total assets 38,604,000us-gaap_Assets 28,617,000us-gaap_Assets
Current liabilities    
Accounts payable, accrued expenses and other 1,547,000us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent 1,167,000us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent
Deferred revenue 142,000us-gaap_DeferredRevenueCurrent 244,000us-gaap_DeferredRevenueCurrent
Accrued severance 433,000us-gaap_EmployeeRelatedLiabilitiesCurrent 457,000us-gaap_EmployeeRelatedLiabilitiesCurrent
Total current liabilities 2,122,000us-gaap_LiabilitiesCurrent 1,868,000us-gaap_LiabilitiesCurrent
Preferred B stock conversion liability 19,425,000aphb_PrefferedBStockConversionLiability 12,320,000aphb_PrefferedBStockConversionLiability
Warrant liability 14,727,000us-gaap_WarrantsAndRightsOutstanding 5,826,000us-gaap_WarrantsAndRightsOutstanding
Accrued severance 0aphb_EmployeeRelatedLiabilitiesNoncurrent 98,000aphb_EmployeeRelatedLiabilitiesNoncurrent
Deferred tax liability 3,078,000us-gaap_DeferredTaxLiabilitiesNoncurrent 3,078,000us-gaap_DeferredTaxLiabilitiesNoncurrent
Total liabilities 39,352,000us-gaap_Liabilities 23,190,000us-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 March 31, 2015 and December 31, 2014 (liquidation preference of $14,380,000 and $14,042,000 at March 31, 2015 and December 31, 2014, respectively) 2,328,000us-gaap_TemporaryEquityValueExcludingAdditionalPaidInCapital 1,990,000us-gaap_TemporaryEquityValueExcludingAdditionalPaidInCapital
Stockholders' equity (deficit)    
Common stock, $0.01 par value, 445,000,000 shares authorized, 277,946,973 shares issued and outstanding at March 31, 2015 and 199,159,093 shares issued and outstanding December 31, 2014 2,779,000us-gaap_CommonStockValue 1,992,000us-gaap_CommonStockValue
Additional paid-in capital 370,644,000us-gaap_AdditionalPaidInCapital 363,451,000us-gaap_AdditionalPaidInCapital
Accumulated deficit (376,499,000)us-gaap_RetainedEarningsAccumulatedDeficit (362,006,000)us-gaap_RetainedEarningsAccumulatedDeficit
Total stockholders’ equity (deficit) (3,076,000)us-gaap_StockholdersEquity 3,437,000us-gaap_StockholdersEquity
Total liabilities, Series B redeemable preferred stock and stockholders’ equity (deficit) $ 38,604,000us-gaap_LiabilitiesAndStockholdersEquity $ 28,617,000us-gaap_LiabilitiesAndStockholdersEquity