v2.4.1.9

Quarterly Financial Information (Unaudited) (Details) (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
Revenues [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 36,573 us-gaap_Revenues | $ 34,348 us-gaap_Revenues | $ 32,302 us-gaap_Revenues | $ 30,356 us-gaap_Revenues | $ 29,039 us-gaap_Revenues | $ 27,749 us-gaap_Revenues | $ 26,291 us-gaap_Revenues | $ 24,883 us-gaap_Revenues | $ 133,579 us-gaap_Revenues | $ 107,962 us-gaap_Revenues | $ 91,420 us-gaap_Revenues
Cost of revenues | 7,521 us-gaap_CostOfRevenue | 7,421 us-gaap_CostOfRevenue | 7,175 us-gaap_CostOfRevenue | 6,846 us-gaap_CostOfRevenue | 6,526 us-gaap_CostOfRevenue | 6,415 us-gaap_CostOfRevenue | 5,924 us-gaap_CostOfRevenue | 5,795 us-gaap_CostOfRevenue | 28,963 us-gaap_CostOfRevenue | 24,660 us-gaap_CostOfRevenue | 18,404 us-gaap_CostOfRevenue
Gross profit | 29,052 us-gaap_GrossProfit | 26,927 us-gaap_GrossProfit | 25,127 us-gaap_GrossProfit | 23,510 us-gaap_GrossProfit | 22,513 us-gaap_GrossProfit | 21,334 us-gaap_GrossProfit | 20,367 us-gaap_GrossProfit | 19,088 us-gaap_GrossProfit | 104,616 us-gaap_GrossProfit | 83,302 us-gaap_GrossProfit | 73,016 us-gaap_GrossProfit
Operating expenses: |  |  |  |  |  |  |  |  |  |  |
Research and development | 7,015 us-gaap_ResearchAndDevelopmentExpense | 6,490 us-gaap_ResearchAndDevelopmentExpense | 6,411 us-gaap_ResearchAndDevelopmentExpense | 6,404 us-gaap_ResearchAndDevelopmentExpense | 5,939 us-gaap_ResearchAndDevelopmentExpense | 5,151 us-gaap_ResearchAndDevelopmentExpense | 5,291 us-gaap_ResearchAndDevelopmentExpense | 5,297 us-gaap_ResearchAndDevelopmentExpense | 26,320 us-gaap_ResearchAndDevelopmentExpense | 21,678 us-gaap_ResearchAndDevelopmentExpense | 20,195 us-gaap_ResearchAndDevelopmentExpense
Sales and marketing | 11,938 us-gaap_SellingAndMarketingExpense | 11,774 us-gaap_SellingAndMarketingExpense | 11,845 us-gaap_SellingAndMarketingExpense | 12,492 us-gaap_SellingAndMarketingExpense | 11,784 us-gaap_SellingAndMarketingExpense | 10,411 us-gaap_SellingAndMarketingExpense | 10,160 us-gaap_SellingAndMarketingExpense | 10,168 us-gaap_SellingAndMarketingExpense | 48,049 us-gaap_SellingAndMarketingExpense | 42,523 us-gaap_SellingAndMarketingExpense | 37,738 us-gaap_SellingAndMarketingExpense
General and administrative | 5,888 us-gaap_GeneralAndAdministrativeExpense | 5,156 us-gaap_GeneralAndAdministrativeExpense | 5,081 us-gaap_GeneralAndAdministrativeExpense | 4,875 us-gaap_GeneralAndAdministrativeExpense | 4,566 us-gaap_GeneralAndAdministrativeExpense | 4,277 us-gaap_GeneralAndAdministrativeExpense | 4,053 us-gaap_GeneralAndAdministrativeExpense | 3,896 us-gaap_GeneralAndAdministrativeExpense | 21,000 us-gaap_GeneralAndAdministrativeExpense | 16,792 us-gaap_GeneralAndAdministrativeExpense | 12,079 us-gaap_GeneralAndAdministrativeExpense
Total operating expenses | 24,841 us-gaap_OperatingExpenses | 23,420 us-gaap_OperatingExpenses | 23,337 us-gaap_OperatingExpenses | 23,771 us-gaap_OperatingExpenses | 22,289 us-gaap_OperatingExpenses | 19,839 us-gaap_OperatingExpenses | 19,504 us-gaap_OperatingExpenses | 19,361 us-gaap_OperatingExpenses | 95,369 us-gaap_OperatingExpenses | 80,993 us-gaap_OperatingExpenses | 70,012 us-gaap_OperatingExpenses
Income from operations | 4,211 us-gaap_OperatingIncomeLoss | 3,507 us-gaap_OperatingIncomeLoss | 1,790 us-gaap_OperatingIncomeLoss | (261)us-gaap_OperatingIncomeLoss | 224 us-gaap_OperatingIncomeLoss | 1,495 us-gaap_OperatingIncomeLoss | 863 us-gaap_OperatingIncomeLoss | (273)us-gaap_OperatingIncomeLoss | 9,247 us-gaap_OperatingIncomeLoss | 2,309 us-gaap_OperatingIncomeLoss | 3,004 us-gaap_OperatingIncomeLoss
Other income (expense), net | (568)us-gaap_NonoperatingIncomeExpense | (119)us-gaap_NonoperatingIncomeExpense | 41 us-gaap_NonoperatingIncomeExpense | 12 us-gaap_NonoperatingIncomeExpense | (61)us-gaap_NonoperatingIncomeExpense | 12 us-gaap_NonoperatingIncomeExpense | 51 us-gaap_NonoperatingIncomeExpense | (270)us-gaap_NonoperatingIncomeExpense | (634)us-gaap_NonoperatingIncomeExpense | (268)us-gaap_NonoperatingIncomeExpense | (425)us-gaap_NonoperatingIncomeExpense
Income before income taxes | 3,643 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 3,388 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 1,831 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | (249)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 163 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 1,507 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 914 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | (543)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 8,613 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 2,041 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 2,579 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Provision for (benefit from) income taxes | (22,270)us-gaap_IncomeTaxExpenseBenefit | 283 us-gaap_IncomeTaxExpenseBenefit | 174 us-gaap_IncomeTaxExpenseBenefit | 182 us-gaap_IncomeTaxExpenseBenefit | 128 us-gaap_IncomeTaxExpenseBenefit | 210 us-gaap_IncomeTaxExpenseBenefit | 92 us-gaap_IncomeTaxExpenseBenefit | 70 us-gaap_IncomeTaxExpenseBenefit | (21,631)us-gaap_IncomeTaxExpenseBenefit | 500 us-gaap_IncomeTaxExpenseBenefit | 358 us-gaap_IncomeTaxExpenseBenefit
Net income | 25,913 us-gaap_NetIncomeLoss | 3,105 us-gaap_NetIncomeLoss | 1,657 us-gaap_NetIncomeLoss | (431)us-gaap_NetIncomeLoss | 35 us-gaap_NetIncomeLoss | 1,297 us-gaap_NetIncomeLoss | 822 us-gaap_NetIncomeLoss | (613)us-gaap_NetIncomeLoss | 30,244 us-gaap_NetIncomeLoss | 1,541 us-gaap_NetIncomeLoss | 2,221 us-gaap_NetIncomeLoss
Net income (loss) attributable to common stockholders | 25,913 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 3,105 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 1,657 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | (431)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 35 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 1,295 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 821 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | (613)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 30,244 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 1,539 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 1,049 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Earnings Per Share [Abstract] |  |  |  |  |  |  |  |  |  |  |
Basic (in usd per share) | $ 0.77 us-gaap_EarningsPerShareBasic | $ 0.09 us-gaap_EarningsPerShareBasic | $ 0.05 us-gaap_EarningsPerShareBasic | $ (0.01)us-gaap_EarningsPerShareBasic | $ 0.00 us-gaap_EarningsPerShareBasic | $ 0.04 us-gaap_EarningsPerShareBasic | $ 0.03 us-gaap_EarningsPerShareBasic | $ (0.02)us-gaap_EarningsPerShareBasic | $ 0.92 us-gaap_EarningsPerShareBasic | $ 0.05 us-gaap_EarningsPerShareBasic | $ 0.09 us-gaap_EarningsPerShareBasic
Diluted (in usd per share) | $ 0.69 us-gaap_EarningsPerShareDiluted | $ 0.08 us-gaap_EarningsPerShareDiluted | $ 0.04 us-gaap_EarningsPerShareDiluted | $ (0.01)us-gaap_EarningsPerShareDiluted | $ 0.00 us-gaap_EarningsPerShareDiluted | $ 0.04 us-gaap_EarningsPerShareDiluted | $ 0.02 us-gaap_EarningsPerShareDiluted | $ (0.02)us-gaap_EarningsPerShareDiluted | $ 0.81 us-gaap_EarningsPerShareDiluted | $ 0.04 us-gaap_EarningsPerShareDiluted | $ 0.08 us-gaap_EarningsPerShareDiluted
Federal and State Jurisdictions [Member] |  |  |  |  |  |  |  |  |  |  |
Operating expenses: |  |  |  |  |  |  |  |  |  |  |
Provision for (benefit from) income taxes | $ (23,700)us-gaap_IncomeTaxExpenseBenefit / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember |  |  |  |  |  |  |  |  |  |

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