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Summary of Quarterly Financial Information (Detail) (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 [Line Items] |  |  |  |  |  |  |  |  |  |  |
Product revenue | $ 9,587 us-gaap_SalesRevenueGoodsNet | $ 10,362 us-gaap_SalesRevenueGoodsNet | $ 8,601 us-gaap_SalesRevenueGoodsNet | $ 7,866 us-gaap_SalesRevenueGoodsNet | $ 9,232 us-gaap_SalesRevenueGoodsNet | $ 10,542 us-gaap_SalesRevenueGoodsNet | $ 10,150 us-gaap_SalesRevenueGoodsNet | $ 9,733 us-gaap_SalesRevenueGoodsNet | $ 36,416 us-gaap_SalesRevenueGoodsNet | $ 39,657 us-gaap_SalesRevenueGoodsNet | $ 36,695 us-gaap_SalesRevenueGoodsNet
Gross profit on product revenue | 2,997 us-gaap_GrossProfit | 4,673 us-gaap_GrossProfit | 3,849 us-gaap_GrossProfit | 3,709 us-gaap_GrossProfit | 4,293 us-gaap_GrossProfit | 3,716 us-gaap_GrossProfit | 4,403 us-gaap_GrossProfit | 4,643 us-gaap_GrossProfit | 15,228 us-gaap_GrossProfit | 17,055 us-gaap_GrossProfit | 16,079 us-gaap_GrossProfit
Net loss | $ (20,182)us-gaap_NetIncomeLoss | $ (10,759)us-gaap_NetIncomeLoss | $ (7,589)us-gaap_NetIncomeLoss | $ (225)us-gaap_NetIncomeLoss | $ (5,860)us-gaap_NetIncomeLoss | $ (20,501)us-gaap_NetIncomeLoss | $ (6,724)us-gaap_NetIncomeLoss | $ (10,252)us-gaap_NetIncomeLoss | $ (38,755)us-gaap_NetIncomeLoss | $ (43,337)us-gaap_NetIncomeLoss | $ (15,917)us-gaap_NetIncomeLoss
Basic | $ (0.26)us-gaap_EarningsPerShareBasic | $ (0.14)us-gaap_EarningsPerShareBasic | $ (0.10)us-gaap_EarningsPerShareBasic | $ 0.00 us-gaap_EarningsPerShareBasic | $ (0.08)us-gaap_EarningsPerShareBasic | $ (0.29)us-gaap_EarningsPerShareBasic | $ (0.10)us-gaap_EarningsPerShareBasic | $ (0.17)us-gaap_EarningsPerShareBasic | $ (0.52)us-gaap_EarningsPerShareBasic | $ (0.64)us-gaap_EarningsPerShareBasic | $ (0.29)us-gaap_EarningsPerShareBasic
Diluted | $ (0.26)us-gaap_EarningsPerShareDiluted | $ (0.16)us-gaap_EarningsPerShareDiluted | $ (0.16)us-gaap_EarningsPerShareDiluted | $ (0.12)us-gaap_EarningsPerShareDiluted | $ (0.10)us-gaap_EarningsPerShareDiluted | $ (0.29)us-gaap_EarningsPerShareDiluted | $ (0.10)us-gaap_EarningsPerShareDiluted | $ (0.17)us-gaap_EarningsPerShareDiluted | $ (0.61)us-gaap_EarningsPerShareDiluted | $ (0.64)us-gaap_EarningsPerShareDiluted | $ (0.33)us-gaap_EarningsPerShareDiluted

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