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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	$ 9,587us-gaap_SalesRevenueGoodsNet	$ 10,362us-gaap_SalesRevenueGoodsNet	$ 8,601us-gaap_SalesRevenueGoodsNet	$ 7,866us-gaap_SalesRevenueGoodsNet	$ 9,232us-gaap_SalesRevenueGoodsNet	$ 10,542us-gaap_SalesRevenueGoodsNet	$ 10,150us-gaap_SalesRevenueGoodsNet	$ 9,733us-gaap_SalesRevenueGoodsNet	$ 36,416us-gaap_SalesRevenueGoodsNet	$ 39,657us-gaap_SalesRevenueGoodsNet	$ 36,695us-gaap_SalesRevenueGoodsNet
Gross profit on product revenue	2,997us-gaap_GrossProfit	4,673us-gaap_GrossProfit	3,849us-gaap_GrossProfit	3,709us-gaap_GrossProfit	4,293us-gaap_GrossProfit	3,716us-gaap_GrossProfit	4,403us-gaap_GrossProfit	4,643us-gaap_GrossProfit	15,228us-gaap_GrossProfit	17,055us-gaap_GrossProfit	16,079us-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	$ 0.00us-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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