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BALANCE SHEETS (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Current assets:    
Cash and cash equivalents $ 15,354us-gaap_CashAndCashEquivalentsAtCarryingValue $ 16,756us-gaap_CashAndCashEquivalentsAtCarryingValue
Other current assets 134us-gaap_OtherAssetsCurrent 169us-gaap_OtherAssetsCurrent
Total current assets 15,488us-gaap_AssetsCurrent 16,925us-gaap_AssetsCurrent
Property and equipment, net 36us-gaap_PropertyPlantAndEquipmentNet 29us-gaap_PropertyPlantAndEquipmentNet
Other assets 608us-gaap_OtherAssetsNoncurrent 130us-gaap_OtherAssetsNoncurrent
Total assets 16,132us-gaap_Assets 17,084us-gaap_Assets
Current liabilities:    
Accounts payable 795us-gaap_AccountsPayableCurrent 597us-gaap_AccountsPayableCurrent
Accrued compensation and employee benefits 329us-gaap_EmployeeRelatedLiabilitiesCurrent 459us-gaap_EmployeeRelatedLiabilitiesCurrent
Accrued expenses and other liabilities 264us-gaap_OtherLiabilitiesCurrent 446us-gaap_OtherLiabilitiesCurrent
Total current liabilities 1,388us-gaap_LiabilitiesCurrent 1,502us-gaap_LiabilitiesCurrent
Deferred rent, net of current portion 3us-gaap_DeferredRentCreditNoncurrent 1us-gaap_DeferredRentCreditNoncurrent
Total liabilities 1,391us-gaap_Liabilities 1,503us-gaap_Liabilities
Commitments and contingencies      
Stockholders’ equity:    
Preferred stock, $0.001 par value; 5 million shares authorized; no shares issued or outstanding. Series A convertible preferred stock, $0.001 par value; 135,000 shares designated from authorized preferred stock; no shares issued or outstanding at December 31, 2014 and 2013      
Common stock, $0.001 par value; 100 million shares authorized at December 31, 2014 and 2013; 21,150,486 and 15,685,562 shares issued and outstanding at December 31, 2014 and 2013, respectively 21us-gaap_CommonStockValue 16us-gaap_CommonStockValue
Additional paid-in capital 99,342us-gaap_AdditionalPaidInCapitalCommonStock 90,498us-gaap_AdditionalPaidInCapitalCommonStock
Accumulated deficit (84,622)us-gaap_RetainedEarningsAccumulatedDeficit (74,933)us-gaap_RetainedEarningsAccumulatedDeficit
Total stockholders’ equity 14,741us-gaap_StockholdersEquity 15,581us-gaap_StockholdersEquity
Total liabilities and stockholders’ equity $ 16,132us-gaap_LiabilitiesAndStockholdersEquity $ 17,084us-gaap_LiabilitiesAndStockholdersEquity