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Quarterly Financial Information (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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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, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Summary of selected quarterly financial information |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net revenues | $ 1,735 us-gaap_Revenues | $ 1,126 us-gaap_Revenues | $ 865 us-gaap_Revenues | $ 1,014 us-gaap_Revenues | $ 1,009 us-gaap_Revenues | $ 1,076 us-gaap_Revenues | $ 1,084 us-gaap_Revenues | $ 548 us-gaap_Revenues | $ 2,320 us-gaap_Revenues | $ 1,679 us-gaap_Revenues | $ 1,974 us-gaap_Revenues | $ 1,164 us-gaap_Revenues | $ 4,740 us-gaap_Revenues | $ 3,717 us-gaap_Revenues | $ 7,137 us-gaap_Revenues
Cost of revenues | 469 us-gaap_CostOfRevenue | 422 us-gaap_CostOfRevenue | 452 us-gaap_CostOfRevenue | 166 us-gaap_CostOfRevenue | 199 us-gaap_CostOfRevenue | 765 us-gaap_CostOfRevenue | 662 us-gaap_CostOfRevenue | 16 us-gaap_CostOfRevenue | 385 us-gaap_CostOfRevenue | 337 us-gaap_CostOfRevenue | 494 us-gaap_CostOfRevenue | 249 us-gaap_CostOfRevenue | 1,509 us-gaap_CostOfRevenue | 1,642 us-gaap_CostOfRevenue | 1,465 us-gaap_CostOfRevenue
Gross margin | 1,266 us-gaap_GrossProfit | 704 us-gaap_GrossProfit | 413 us-gaap_GrossProfit | 848 us-gaap_GrossProfit | 810 us-gaap_GrossProfit | 311 us-gaap_GrossProfit | 422 us-gaap_GrossProfit | 532 us-gaap_GrossProfit | 1,935 us-gaap_GrossProfit | 1,342 us-gaap_GrossProfit | 1,480 us-gaap_GrossProfit | 915 us-gaap_GrossProfit | 3,231 us-gaap_GrossProfit | 2,075 us-gaap_GrossProfit | 5,672 us-gaap_GrossProfit
Net loss | $ (3,107)us-gaap_NetIncomeLoss | $ (3,245)us-gaap_NetIncomeLoss | $ (3,874)us-gaap_NetIncomeLoss | $ (4,008)us-gaap_NetIncomeLoss | $ (3,047)us-gaap_NetIncomeLoss | $ (3,343)us-gaap_NetIncomeLoss | $ (3,120)us-gaap_NetIncomeLoss | $ (3,570)us-gaap_NetIncomeLoss | $ (2,128)us-gaap_NetIncomeLoss | $ (2,144)us-gaap_NetIncomeLoss | $ (3,427)us-gaap_NetIncomeLoss | $ (1,588)us-gaap_NetIncomeLoss | $ (14,234)us-gaap_NetIncomeLoss | $ (13,080)us-gaap_NetIncomeLoss | $ (9,287)us-gaap_NetIncomeLoss
Net loss per basic and diluted common share | $ (0.08)us-gaap_EarningsPerShareBasicAndDiluted | $ (0.08)us-gaap_EarningsPerShareBasicAndDiluted | $ (0.10)us-gaap_EarningsPerShareBasicAndDiluted | $ (0.11)us-gaap_EarningsPerShareBasicAndDiluted | $ (0.08)us-gaap_EarningsPerShareBasicAndDiluted | $ (0.09)us-gaap_EarningsPerShareBasicAndDiluted | $ (0.09)us-gaap_EarningsPerShareBasicAndDiluted | $ (0.11)us-gaap_EarningsPerShareBasicAndDiluted | $ (0.07)us-gaap_EarningsPerShareBasicAndDiluted | $ (0.06)us-gaap_EarningsPerShareBasicAndDiluted | $ (0.10)us-gaap_EarningsPerShareBasicAndDiluted | $ (0.05)us-gaap_EarningsPerShareBasicAndDiluted | $ (0.36)us-gaap_EarningsPerShareBasicAndDiluted | $ (0.37)us-gaap_EarningsPerShareBasicAndDiluted | $ (0.28)us-gaap_EarningsPerShareBasicAndDiluted

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