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Consolidated Balance Sheets (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Current assets:    
Cash and cash equivalents $ 7,440us-gaap_CashAndCashEquivalentsAtCarryingValue $ 17,192us-gaap_CashAndCashEquivalentsAtCarryingValue
Marketable securities 6,994us-gaap_MarketableSecuritiesCurrent 3,200us-gaap_MarketableSecuritiesCurrent
Receivables, net of allowance for doubtful accounts of $58 and $129, as of December 31, 2014 and 2013 respectively 9,916us-gaap_AccountsReceivableNetCurrent 9,378us-gaap_AccountsReceivableNetCurrent
Inventories 12,766us-gaap_InventoryNet 10,758us-gaap_InventoryNet
Deferred Costs, Current 1,698us-gaap_DeferredCostsCurrent 1,520us-gaap_DeferredCostsCurrent
Deferred income taxes 3,824us-gaap_DeferredTaxAssetsNetCurrent 3,325us-gaap_DeferredTaxAssetsNetCurrent
Prepaid expenses and other assets 2,143us-gaap_OtherAssetsCurrent 2,693us-gaap_OtherAssetsCurrent
Total current assets 44,781us-gaap_AssetsCurrent 48,066us-gaap_AssetsCurrent
Long-term marketable securities 19,162us-gaap_MarketableSecuritiesNoncurrent 22,326us-gaap_MarketableSecuritiesNoncurrent
Long-term inventories, net 876us-gaap_InventoryNoncurrent 551us-gaap_InventoryNoncurrent
Property and equipment, net 2,039us-gaap_PropertyPlantAndEquipmentNet 1,825us-gaap_PropertyPlantAndEquipmentNet
Intangibles, net 7,896us-gaap_IntangibleAssetsNetExcludingGoodwill 3,710us-gaap_IntangibleAssetsNetExcludingGoodwill
Goodwill 12,724us-gaap_Goodwill 3,472us-gaap_Goodwill
Deferred income taxes 1,265us-gaap_DeferredTaxAssetsNetNoncurrent 1,024us-gaap_DeferredTaxAssetsNetNoncurrent
Other assets 117us-gaap_OtherAssetsNoncurrent 87us-gaap_OtherAssetsNoncurrent
Total assets 88,860us-gaap_Assets 81,061us-gaap_Assets
Current liabilities:    
Accounts payable 3,057us-gaap_AccountsPayableCurrent 2,730us-gaap_AccountsPayableCurrent
Accrued liabilities 2,694us-gaap_AccruedLiabilitiesCurrent 1,761us-gaap_AccruedLiabilitiesCurrent
Deferred product revenue 5,004us-gaap_DeferredRevenueCurrent 4,158us-gaap_DeferredRevenueCurrent
Total current liabilities 10,755us-gaap_LiabilitiesCurrent 8,649us-gaap_LiabilitiesCurrent
Deferred rent 248us-gaap_DeferredRentCreditNoncurrent 286us-gaap_DeferredRentCreditNoncurrent
Other long-term liabilities 1,841us-gaap_OtherLiabilitiesNoncurrent 1,791us-gaap_OtherLiabilitiesNoncurrent
Total liabilities 12,844us-gaap_Liabilities 10,726us-gaap_Liabilities
Shareholders' equity:    
Common stock, par value $0.001, 50,000,000 shares authorized, 9,097,827 and 8,986,080 shares issued and outstanding as of December 31, 2014 and 2013, respectively 9us-gaap_CommonStockValue 9us-gaap_CommonStockValue
Additional paid-in capital 44,939us-gaap_AdditionalPaidInCapitalCommonStock 41,311us-gaap_AdditionalPaidInCapitalCommonStock
Accumulated other comprehensive income (loss) (8)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax 23us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Retained earnings 31,076us-gaap_RetainedEarningsAccumulatedDeficit 28,992us-gaap_RetainedEarningsAccumulatedDeficit
Total shareholders' equity 76,016us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest 70,335us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
Total liabilities and shareholders' equity $ 88,860us-gaap_LiabilitiesAndStockholdersEquity $ 81,061us-gaap_LiabilitiesAndStockholdersEquity