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Balance Sheets (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Current assets:    
Cash and cash equivalents $ 1,862us-gaap_CashAndCashEquivalentsAtCarryingValue $ 3,276us-gaap_CashAndCashEquivalentsAtCarryingValue
Investments   30us-gaap_ShortTermInvestments
Trade accounts receivable, less allowance for doubtful accounts of $6 on December 31, 2014 and 2013 388us-gaap_AccountsReceivableNetCurrent 52us-gaap_AccountsReceivableNetCurrent
Other receivables   1us-gaap_OtherReceivables
Inventories, net 950us-gaap_InventoryNet 976us-gaap_InventoryNet
Prepaid expenses and other current assets 367us-gaap_PrepaidExpenseAndOtherAssetsCurrent 202us-gaap_PrepaidExpenseAndOtherAssetsCurrent
Total current assets 3,567us-gaap_AssetsCurrent 4,537us-gaap_AssetsCurrent
Equipment and leasehold improvements, net 2,138us-gaap_PropertyPlantAndEquipmentNet 2,464us-gaap_PropertyPlantAndEquipmentNet
Other assets, net 25us-gaap_OtherAssetsNoncurrent 27us-gaap_OtherAssetsNoncurrent
Total assets 5,730us-gaap_Assets 7,028us-gaap_Assets
Current liabilities:    
Current portion of capital lease obligations 70us-gaap_CapitalLeaseObligationsCurrent 31us-gaap_CapitalLeaseObligationsCurrent
Accounts payable 493us-gaap_AccountsPayableCurrent 503us-gaap_AccountsPayableCurrent
Accrued expenses 413us-gaap_AccruedLiabilitiesCurrent 323us-gaap_AccruedLiabilitiesCurrent
Total current liabilities 976us-gaap_LiabilitiesCurrent 857us-gaap_LiabilitiesCurrent
Long-term portion of capital lease obligations 121us-gaap_CapitalLeaseObligationsNoncurrent 10us-gaap_CapitalLeaseObligationsNoncurrent
Long-term deferred rent 621us-gaap_DeferredRentCreditNoncurrent 633us-gaap_DeferredRentCreditNoncurrent
Asset retirement obligations 166us-gaap_AssetRetirementObligationsNoncurrent 160us-gaap_AssetRetirementObligationsNoncurrent
Total long-term liabilities 908us-gaap_LiabilitiesNoncurrent 803us-gaap_LiabilitiesNoncurrent
Contingent liabilities      
Stockholders' equity:    
Preferred stock, $.01 par value, 24,088 shares authorized and no shares issued and outstanding 0us-gaap_PreferredStockValue 0us-gaap_PreferredStockValue
Common stock, $.01 par value, 35,000,000 shares authorized; 28,516,163 and 28,481,496 shares issued and outstanding on December 31, 2014 and December 31, 2013, respectively 285us-gaap_CommonStockValue 285us-gaap_CommonStockValue
Additional paid-in capital 95,966us-gaap_AdditionalPaidInCapital 95,761us-gaap_AdditionalPaidInCapital
Accumulated deficit (92,405)us-gaap_RetainedEarningsAccumulatedDeficit (90,678)us-gaap_RetainedEarningsAccumulatedDeficit
Total stockholders' equity 3,846us-gaap_StockholdersEquity 5,368us-gaap_StockholdersEquity
Total liabilities and stockholders' equity $ 5,730us-gaap_LiabilitiesAndStockholdersEquity $ 7,028us-gaap_LiabilitiesAndStockholdersEquity