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Quarterly Financial Results (Unaudited) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Quarterly Financial Information Disclosure [Abstract]                      
Product sales $ 25,276us-gaap_SalesRevenueGoodsNet $ 16,862us-gaap_SalesRevenueGoodsNet $ 20,998us-gaap_SalesRevenueGoodsNet $ 18,007us-gaap_SalesRevenueGoodsNet $ 18,862us-gaap_SalesRevenueGoodsNet $ 20,331us-gaap_SalesRevenueGoodsNet $ 25,886us-gaap_SalesRevenueGoodsNet $ 25,216us-gaap_SalesRevenueGoodsNet $ 81,143us-gaap_SalesRevenueGoodsNet $ 90,295us-gaap_SalesRevenueGoodsNet $ 90,677us-gaap_SalesRevenueGoodsNet
Service sales 25,158us-gaap_SalesRevenueServicesNet 27,388us-gaap_SalesRevenueServicesNet 19,924us-gaap_SalesRevenueServicesNet 18,978us-gaap_SalesRevenueServicesNet 20,086us-gaap_SalesRevenueServicesNet 19,885us-gaap_SalesRevenueServicesNet 17,311us-gaap_SalesRevenueServicesNet 14,711us-gaap_SalesRevenueServicesNet 91,448us-gaap_SalesRevenueServicesNet 71,993us-gaap_SalesRevenueServicesNet 46,435us-gaap_SalesRevenueServicesNet
Gross profit 22,567us-gaap_GrossProfit 18,802us-gaap_GrossProfit 17,485us-gaap_GrossProfit 14,593us-gaap_GrossProfit 15,390us-gaap_GrossProfit 16,527us-gaap_GrossProfit 18,026us-gaap_GrossProfit 15,769us-gaap_GrossProfit      
Net (loss) income $ 958us-gaap_NetIncomeLoss $ 151us-gaap_NetIncomeLoss $ 55us-gaap_NetIncomeLoss $ (1,123)us-gaap_NetIncomeLoss $ (365)us-gaap_NetIncomeLoss $ 1,386us-gaap_NetIncomeLoss $ 1,549us-gaap_NetIncomeLoss $ 1,963us-gaap_NetIncomeLoss $ 41us-gaap_NetIncomeLoss $ 4,533us-gaap_NetIncomeLoss $ 3,580us-gaap_NetIncomeLoss
Net (loss) income per share:                      
Basic (in dollars per share) $ 0.06us-gaap_EarningsPerShareBasic [1] $ 0.01us-gaap_EarningsPerShareBasic [1] $ 0.00us-gaap_EarningsPerShareBasic [1] $ (0.07)us-gaap_EarningsPerShareBasic [1] $ (0.02)us-gaap_EarningsPerShareBasic [1] $ 0.09us-gaap_EarningsPerShareBasic [1] $ 0.10us-gaap_EarningsPerShareBasic [1] $ 0.13us-gaap_EarningsPerShareBasic [1] $ 0.00us-gaap_EarningsPerShareBasic $ 0.30us-gaap_EarningsPerShareBasic $ 0.24us-gaap_EarningsPerShareBasic
Diluted (in dollars per share) $ 0.06us-gaap_EarningsPerShareDiluted [1] $ 0.01us-gaap_EarningsPerShareDiluted [1] $ 0.00us-gaap_EarningsPerShareDiluted [1] $ (0.07)us-gaap_EarningsPerShareDiluted [1] $ (0.02)us-gaap_EarningsPerShareDiluted [1] $ 0.09us-gaap_EarningsPerShareDiluted [1] $ 0.10us-gaap_EarningsPerShareDiluted [1] $ 0.13us-gaap_EarningsPerShareDiluted [1] $ 0.00us-gaap_EarningsPerShareDiluted $ 0.30us-gaap_EarningsPerShareDiluted $ 0.24us-gaap_EarningsPerShareDiluted
[1] Net (loss) income per share is computed independently for each of the quarters. Therefore, the net (loss) income per share for the four quarters may not equal the annual net (loss) income per share data.