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CONSOLIDATED BALANCE SHEETS (USD $)
Dec. 31, 2014
Dec. 31, 2013
Current assets    
Cash and cash equivalents $ 6,593,000us-gaap_CashAndCashEquivalentsAtCarryingValue $ 14,235,000us-gaap_CashAndCashEquivalentsAtCarryingValue
Short-term investments 22,710,000us-gaap_MarketableSecuritiesCurrent 47,835,000us-gaap_MarketableSecuritiesCurrent
Other current assets 3,354,000us-gaap_PrepaidExpenseAndOtherAssetsCurrent 2,145,000us-gaap_PrepaidExpenseAndOtherAssetsCurrent
Total current assets 32,657,000us-gaap_AssetsCurrent 64,215,000us-gaap_AssetsCurrent
Property and equipment, net 496,000us-gaap_PropertyPlantAndEquipmentNet 322,000us-gaap_PropertyPlantAndEquipmentNet
Other assets 326,000us-gaap_OtherAssetsNoncurrent 0us-gaap_OtherAssetsNoncurrent
Total assets 33,479,000us-gaap_Assets 64,537,000us-gaap_Assets
Current liabilities    
Accounts payable and accrued liabilities 5,396,000us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent 5,245,000us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent
Warrant liability 0us-gaap_DerivativeLiabilitiesCurrent 33,407,000us-gaap_DerivativeLiabilitiesCurrent
Total current liabilities 5,396,000us-gaap_LiabilitiesCurrent 38,652,000us-gaap_LiabilitiesCurrent
Other liability 21,000us-gaap_OtherLiabilitiesNoncurrent 0us-gaap_OtherLiabilitiesNoncurrent
Total current liabilities 5,417,000us-gaap_Liabilities 38,652,000us-gaap_Liabilities
Commitments and contingencies      
Stockholders' equity    
Preferred stock, $0.001 par value, 10,000,000 shares authorized; none issued and outstanding at both December 31, 2014 and December 31, 2013 0us-gaap_PreferredStockValue 0us-gaap_PreferredStockValue
Common stock, $0.001 par value; 100,000,000 authorized; 13,566,726 and 13,446,976 issued and outstanding at December 31, 2014 and December 31, 2013, respectively 14,000us-gaap_CommonStockValue 13,000us-gaap_CommonStockValue
Additional paid-in capital 260,616,000us-gaap_AdditionalPaidInCapital 214,756,000us-gaap_AdditionalPaidInCapital
Accumulated other comprehensive income 9,521,000us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax 9,507,000us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Accumulated deficit (242,089,000)us-gaap_RetainedEarningsAccumulatedDeficit (198,391,000)us-gaap_RetainedEarningsAccumulatedDeficit
Total stockholders' equity 28,062,000us-gaap_StockholdersEquity 25,885,000us-gaap_StockholdersEquity
Total liabilities and stockholders' equity $ 33,479,000us-gaap_LiabilitiesAndStockholdersEquity $ 64,537,000us-gaap_LiabilitiesAndStockholdersEquity