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Quarterly Financial Data - Summarized Quarterly Information (Detail) (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, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 10,544 us-gaap_SalesRevenueNet | $ 9,448 us-gaap_SalesRevenueNet | $ 8,528 us-gaap_SalesRevenueNet | $ 8,449 us-gaap_SalesRevenueNet | $ 11,843 us-gaap_SalesRevenueNet | $ 8,746 us-gaap_SalesRevenueNet | $ 10,484 us-gaap_SalesRevenueNet | $ 11,602 us-gaap_SalesRevenueNet | $ 36,979 us-gaap_SalesRevenueNet | $ 42,675 us-gaap_SalesRevenueNet | $ 43,329 us-gaap_SalesRevenueNet
Gross profit | 8,309 us-gaap_GrossProfit | 7,247 us-gaap_GrossProfit | 6,077 us-gaap_GrossProfit | 6,029 us-gaap_GrossProfit | 9,473 us-gaap_GrossProfit | 6,254 us-gaap_GrossProfit | 8,083 us-gaap_GrossProfit | 9,158 us-gaap_GrossProfit | 27,662 us-gaap_GrossProfit | 32,968 us-gaap_GrossProfit | 34,881 us-gaap_GrossProfit
Operating income (loss) | 217 us-gaap_OperatingIncomeLoss | (1,144)us-gaap_OperatingIncomeLoss | (5,681)us-gaap_OperatingIncomeLoss | (5,134)us-gaap_OperatingIncomeLoss | (1,501)us-gaap_OperatingIncomeLoss | (12,980)us-gaap_OperatingIncomeLoss | (7,248)us-gaap_OperatingIncomeLoss | (6,101)us-gaap_OperatingIncomeLoss | (11,742)us-gaap_OperatingIncomeLoss | (27,830)us-gaap_OperatingIncomeLoss | (27,001)us-gaap_OperatingIncomeLoss
Net income (loss) | $ 205 us-gaap_NetIncomeLoss | $ (1,142)us-gaap_NetIncomeLoss | $ (5,695)us-gaap_NetIncomeLoss | $ (5,167)us-gaap_NetIncomeLoss | $ (1,502)us-gaap_NetIncomeLoss | $ (13,049)us-gaap_NetIncomeLoss | $ (7,244)us-gaap_NetIncomeLoss | $ (6,158)us-gaap_NetIncomeLoss | $ (11,799)us-gaap_NetIncomeLoss | $ (27,953)us-gaap_NetIncomeLoss | $ (25,463)us-gaap_NetIncomeLoss
Net (loss) per share, basic | $ 0.00 us-gaap_EarningsPerShareBasic | $ (0.03)us-gaap_EarningsPerShareBasic | $ (0.15)us-gaap_EarningsPerShareBasic | $ (0.14)us-gaap_EarningsPerShareBasic | $ (0.04)us-gaap_EarningsPerShareBasic | $ (0.35)us-gaap_EarningsPerShareBasic | $ (0.19)us-gaap_EarningsPerShareBasic | $ (0.17)us-gaap_EarningsPerShareBasic | $ (0.29)us-gaap_EarningsPerShareBasic | $ (0.76)us-gaap_EarningsPerShareBasic | $ (0.71)us-gaap_EarningsPerShareBasic
Weighted average shares outstanding, basic | 45,053 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 41,225 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 38,518 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 37,714 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 37,027 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 37,036 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 37,247 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 36,614 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 40,649 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 36,982 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 35,849 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Net (loss) per share, diluted | $ 0.00 us-gaap_EarningsPerShareDiluted | $ (0.03)us-gaap_EarningsPerShareDiluted | $ (0.15)us-gaap_EarningsPerShareDiluted | $ (0.14)us-gaap_EarningsPerShareDiluted | $ (0.04)us-gaap_EarningsPerShareDiluted | $ (0.35)us-gaap_EarningsPerShareDiluted | $ (0.19)us-gaap_EarningsPerShareDiluted | $ (0.17)us-gaap_EarningsPerShareDiluted | $ (0.29)us-gaap_EarningsPerShareDiluted | $ (0.76)us-gaap_EarningsPerShareDiluted | $ (0.71)us-gaap_EarningsPerShareDiluted
Weighted average shares outstanding, diluted | 45,053 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 41,225 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 38,518 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 37,714 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 37,027 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 37,036 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 37,247 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 36,614 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 40,649 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 36,982 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 35,849 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding

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