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Quarterly Results of Operations - Quarterly Consolidated Statement of Operations Data (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 | $ 13,619 us-gaap_Revenues | $ 12,051 us-gaap_Revenues | $ 11,831 us-gaap_Revenues | $ 15,436 us-gaap_Revenues | $ 12,067 us-gaap_Revenues | $ 11,342 us-gaap_Revenues | $ 10,201 us-gaap_Revenues | $ 13,860 us-gaap_Revenues | $ 52,937 us-gaap_Revenues | $ 47,470 us-gaap_Revenues | $ 32,169 us-gaap_Revenues
Gross profit | 13,484 us-gaap_GrossProfit | 11,947 us-gaap_GrossProfit | 11,730 us-gaap_GrossProfit | 15,316 us-gaap_GrossProfit | 11,991 us-gaap_GrossProfit | 11,231 us-gaap_GrossProfit | 10,074 us-gaap_GrossProfit | 13,712 us-gaap_GrossProfit |  |  |
Operating income | 1,194 us-gaap_OperatingIncomeLoss | 1,702 us-gaap_OperatingIncomeLoss | 117 us-gaap_OperatingIncomeLoss | 2,954 us-gaap_OperatingIncomeLoss | 648 us-gaap_OperatingIncomeLoss | 814 us-gaap_OperatingIncomeLoss | 448 us-gaap_OperatingIncomeLoss | 1,694 us-gaap_OperatingIncomeLoss | 5,967 us-gaap_OperatingIncomeLoss | 3,604 us-gaap_OperatingIncomeLoss | (6,728)us-gaap_OperatingIncomeLoss
Income before provision for taxes | 1,439 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 1,672 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 261 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 2,947 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 636 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 856 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 476 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 1,704 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments |  |  |
Benefit (provision) for income taxes | (422)us-gaap_IncomeTaxExpenseBenefit | (599)us-gaap_IncomeTaxExpenseBenefit | (92)us-gaap_IncomeTaxExpenseBenefit | (1,083)us-gaap_IncomeTaxExpenseBenefit | 36,767 us-gaap_IncomeTaxExpenseBenefit | (257)us-gaap_IncomeTaxExpenseBenefit | (10)us-gaap_IncomeTaxExpenseBenefit | (17)us-gaap_IncomeTaxExpenseBenefit | (2,196)us-gaap_IncomeTaxExpenseBenefit | 36,483 us-gaap_IncomeTaxExpenseBenefit | (792)us-gaap_IncomeTaxExpenseBenefit
Net income (loss) | $ 1,017 us-gaap_NetIncomeLoss | $ 1,073 us-gaap_NetIncomeLoss | $ 169 us-gaap_NetIncomeLoss | $ 1,864 us-gaap_NetIncomeLoss | $ 37,403 us-gaap_NetIncomeLoss | $ 599 us-gaap_NetIncomeLoss | $ 466 us-gaap_NetIncomeLoss | $ 1,687 us-gaap_NetIncomeLoss | $ 4,123 us-gaap_NetIncomeLoss | $ 40,155 us-gaap_NetIncomeLoss | $ (7,197)us-gaap_NetIncomeLoss
Basic net income per share | $ 0.04 us-gaap_EarningsPerShareBasic | $ 0.04 us-gaap_EarningsPerShareBasic | $ 0.01 us-gaap_EarningsPerShareBasic | $ 0.07 us-gaap_EarningsPerShareBasic | $ 1.31 us-gaap_EarningsPerShareBasic | $ 0.02 us-gaap_EarningsPerShareBasic | $ 0.02 us-gaap_EarningsPerShareBasic | $ 0.06 us-gaap_EarningsPerShareBasic | $ 0.15 us-gaap_EarningsPerShareBasic | $ 1.42 us-gaap_EarningsPerShareBasic | $ (0.26)us-gaap_EarningsPerShareBasic
Shares used in calculating basic net income per share | 27,733 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 28,505 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 28,383 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 28,370 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 28,614 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 28,558 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 28,146 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 27,424 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 28,246 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 28,190 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 27,735 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted net income per share | $ 0.04 us-gaap_EarningsPerShareDiluted | $ 0.04 us-gaap_EarningsPerShareDiluted | $ 0.01 us-gaap_EarningsPerShareDiluted | $ 0.06 us-gaap_EarningsPerShareDiluted | $ 1.26 us-gaap_EarningsPerShareDiluted | $ 0.02 us-gaap_EarningsPerShareDiluted | $ 0.02 us-gaap_EarningsPerShareDiluted | $ 0.06 us-gaap_EarningsPerShareDiluted | $ 0.14 us-gaap_EarningsPerShareDiluted | $ 1.37 us-gaap_EarningsPerShareDiluted | $ (0.26)us-gaap_EarningsPerShareDiluted
Shares used in calculating diluted net income per share | 28,430 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 29,351 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 29,210 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 29,382 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 29,675 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 29,653 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 29,293 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 28,294 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 29,144 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 29,338 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 27,735 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding

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