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Balance Sheets (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Current assets:    
Cash and cash equivalents $ 1,207us-gaap_CashAndCashEquivalentsAtCarryingValue $ 1,862us-gaap_CashAndCashEquivalentsAtCarryingValue
Trade accounts receivable, less allowance for doubtful accounts of $6 on March 31, 2015 and December 31, 2014 1,259us-gaap_AccountsReceivableNetCurrent 388us-gaap_AccountsReceivableNetCurrent
Inventories, net 826us-gaap_InventoryNet 950us-gaap_InventoryNet
Prepaid expenses and other current assets 353us-gaap_PrepaidExpenseAndOtherAssetsCurrent 367us-gaap_PrepaidExpenseAndOtherAssetsCurrent
Total current assets 3,645us-gaap_AssetsCurrent 3,567us-gaap_AssetsCurrent
Equipment and leasehold improvements, net 1,993us-gaap_PropertyPlantAndEquipmentNet 2,138us-gaap_PropertyPlantAndEquipmentNet
Other assets, net 24us-gaap_OtherAssetsNoncurrent 25us-gaap_OtherAssetsNoncurrent
Total assets 5,662us-gaap_Assets 5,730us-gaap_Assets
Current liabilities:    
Current portion of capital lease obligations 62us-gaap_CapitalLeaseObligationsCurrent 70us-gaap_CapitalLeaseObligationsCurrent
Accounts payable 1,009us-gaap_AccountsPayableCurrent 493us-gaap_AccountsPayableCurrent
Accrued expenses 408us-gaap_AccruedLiabilitiesCurrent 413us-gaap_AccruedLiabilitiesCurrent
Total current liabilities 1,479us-gaap_LiabilitiesCurrent 976us-gaap_LiabilitiesCurrent
Long-term portion of capital lease obligations 106us-gaap_CapitalLeaseObligationsNoncurrent 121us-gaap_CapitalLeaseObligationsNoncurrent
Long-term deferred rent 596us-gaap_DeferredRentCreditNoncurrent 621us-gaap_DeferredRentCreditNoncurrent
Asset retirement obligations 168us-gaap_AssetRetirementObligationsNoncurrent 166us-gaap_AssetRetirementObligationsNoncurrent
Total long-term liabilities 870us-gaap_LiabilitiesNoncurrent 908us-gaap_LiabilitiesNoncurrent
Stockholders' equity:    
Preferred stock, $.01 par value, 24,088 shares authorized and no shares issued and outstanding      
Common stock, $.01 par value, 35,000,000 shares authorized; 28,585,496 and 28,516,163 shares issued and outstanding on March 31, 2015 and December 31, 2014, respectively 286us-gaap_CommonStockValue 285us-gaap_CommonStockValue
Additional paid-in capital 96,038us-gaap_AdditionalPaidInCapital 95,966us-gaap_AdditionalPaidInCapital
Accumulated deficit (93,011)us-gaap_RetainedEarningsAccumulatedDeficit (92,405)us-gaap_RetainedEarningsAccumulatedDeficit
Total stockholders' equity 3,313us-gaap_StockholdersEquity 3,846us-gaap_StockholdersEquity
Total liabilities and stockholders' equity $ 5,662us-gaap_LiabilitiesAndStockholdersEquity $ 5,730us-gaap_LiabilitiesAndStockholdersEquity