3.20.2 html 283 385 1 false 63 0 false 5 false false R1.htm 0001001 - Document - Cover Page Sheet http://www.appfolio.com/role/CoverPage Cover Page Cover 1 false false R2.htm 1001002 - Statement - Condensed Consolidated Balance Sheets Sheet http://www.appfolio.com/role/CondensedConsolidatedBalanceSheets Condensed Consolidated Balance Sheets Statements 2 false false R3.htm 1002003 - Statement - Condensed Consolidated Balance Sheets (Parenthetical) Sheet http://www.appfolio.com/role/CondensedConsolidatedBalanceSheetsParenthetical Condensed Consolidated Balance Sheets (Parenthetical) Statements 3 false false R4.htm 1003004 - Statement - Condensed Consolidated Statements of Operations Sheet http://www.appfolio.com/role/CondensedConsolidatedStatementsofOperations Condensed Consolidated Statements of Operations Statements 4 false false R5.htm 1004005 - Statement - Condensed Consolidated Statements of Comprehensive Income Sheet http://www.appfolio.com/role/CondensedConsolidatedStatementsofComprehensiveIncome Condensed Consolidated Statements of Comprehensive Income Statements 5 false false R6.htm 1005006 - Statement - Condensed Consolidated Statements of Stockholders' Equity Sheet http://www.appfolio.com/role/CondensedConsolidatedStatementsofStockholdersEquity Condensed Consolidated Statements of Stockholders' Equity Statements 6 false false R7.htm 1006007 - Statement - Condensed Consolidated Statements of Cash Flows Sheet http://www.appfolio.com/role/CondensedConsolidatedStatementsofCashFlows Condensed Consolidated Statements of Cash Flows Statements 7 false false R8.htm 2101101 - Disclosure - Nature of Business Sheet http://www.appfolio.com/role/NatureofBusiness Nature of Business Notes 8 false false R9.htm 2103102 - Disclosure - Summary of Significant Accounting Policies Sheet http://www.appfolio.com/role/SummaryofSignificantAccountingPolicies Summary of Significant Accounting Policies Notes 9 false false R10.htm 2107103 - Disclosure - Divestitures and Business Combinations Sheet http://www.appfolio.com/role/DivestituresandBusinessCombinations Divestitures and Business Combinations Notes 10 false false R11.htm 2112104 - Disclosure - Investment Securities and Fair Value Measurements Sheet http://www.appfolio.com/role/InvestmentSecuritiesandFairValueMeasurements Investment Securities and Fair Value Measurements Notes 11 false false R12.htm 2118105 - Disclosure - Internal-Use Software Development Costs Sheet http://www.appfolio.com/role/InternalUseSoftwareDevelopmentCosts Internal-Use Software Development Costs Notes 12 false false R13.htm 2123106 - Disclosure - Intangible Assets and Goodwill Sheet http://www.appfolio.com/role/IntangibleAssetsandGoodwill Intangible Assets and Goodwill Notes 13 false false R14.htm 2128107 - Disclosure - Leases Sheet http://www.appfolio.com/role/Leases Leases Notes 14 false false R15.htm 2133108 - Disclosure - Long-Term Debt Sheet http://www.appfolio.com/role/LongTermDebt Long-Term Debt Notes 15 false false R16.htm 2137109 - Disclosure - Commitments and Contingencies Sheet http://www.appfolio.com/role/CommitmentsandContingencies Commitments and Contingencies Notes 16 false false R17.htm 2139110 - Disclosure - Share Repurchase Program Sheet http://www.appfolio.com/role/ShareRepurchaseProgram Share Repurchase Program Notes 17 false false R18.htm 2141111 - Disclosure - Stock-Based Compensation Sheet http://www.appfolio.com/role/StockBasedCompensation Stock-Based Compensation Notes 18 false false R19.htm 2147112 - Disclosure - Income Taxes Sheet http://www.appfolio.com/role/IncomeTaxes Income Taxes Notes 19 false false R20.htm 2149113 - Disclosure - Revenue and Other Information Sheet http://www.appfolio.com/role/RevenueandOtherInformation Revenue and Other Information Notes 20 false false R21.htm 2204201 - Disclosure - Summary of Significant Accounting Policies (Policies) Sheet http://www.appfolio.com/role/SummaryofSignificantAccountingPoliciesPolicies Summary of Significant Accounting Policies (Policies) Policies http://www.appfolio.com/role/SummaryofSignificantAccountingPolicies 21 false false R22.htm 2305301 - Disclosure - Summary of Significant Accounting Policies (Tables) Sheet http://www.appfolio.com/role/SummaryofSignificantAccountingPoliciesTables Summary of Significant Accounting Policies (Tables) Tables http://www.appfolio.com/role/SummaryofSignificantAccountingPolicies 22 false false R23.htm 2308302 - Disclosure - Divestitures and Business Combinations (Tables) Sheet http://www.appfolio.com/role/DivestituresandBusinessCombinationsTables Divestitures and Business Combinations (Tables) Tables http://www.appfolio.com/role/DivestituresandBusinessCombinations 23 false false R24.htm 2313303 - Disclosure - Investment Securities and Fair Value Measurements (Tables) Sheet http://www.appfolio.com/role/InvestmentSecuritiesandFairValueMeasurementsTables Investment Securities and Fair Value Measurements (Tables) Tables http://www.appfolio.com/role/InvestmentSecuritiesandFairValueMeasurements 24 false false R25.htm 2319304 - Disclosure - Internal-Use Software Development Costs (Tables) Sheet http://www.appfolio.com/role/InternalUseSoftwareDevelopmentCostsTables Internal-Use Software Development Costs (Tables) Tables http://www.appfolio.com/role/InternalUseSoftwareDevelopmentCosts 25 false false R26.htm 2324305 - Disclosure - Intangible Assets and Goodwill (Tables) Sheet http://www.appfolio.com/role/IntangibleAssetsandGoodwillTables Intangible Assets and Goodwill (Tables) Tables http://www.appfolio.com/role/IntangibleAssetsandGoodwill 26 false false R27.htm 2329306 - Disclosure - Leases (Tables) Sheet http://www.appfolio.com/role/LeasesTables Leases (Tables) Tables http://www.appfolio.com/role/Leases 27 false false R28.htm 2334307 - Disclosure - Long-Term Debt (Tables) Sheet http://www.appfolio.com/role/LongTermDebtTables Long-Term Debt (Tables) Tables http://www.appfolio.com/role/LongTermDebt 28 false false R29.htm 2342308 - Disclosure - Stock-Based Compensation (Tables) Sheet http://www.appfolio.com/role/StockBasedCompensationTables Stock-Based Compensation (Tables) Tables http://www.appfolio.com/role/StockBasedCompensation 29 false false R30.htm 2350309 - Disclosure - Revenue and Other Information (Tables) Sheet http://www.appfolio.com/role/RevenueandOtherInformationTables Revenue and Other Information (Tables) Tables http://www.appfolio.com/role/RevenueandOtherInformation 30 false false R31.htm 2402401 - Disclosure - Nature of Business (Details) Sheet http://www.appfolio.com/role/NatureofBusinessDetails Nature of Business (Details) Details http://www.appfolio.com/role/NatureofBusiness 31 false false R32.htm 2406402 - Disclosure - Summary of Significant Accounting Policies - Net Income per Share Schedule of Weighted Average Number of Shares (Details) Sheet http://www.appfolio.com/role/SummaryofSignificantAccountingPoliciesNetIncomeperShareScheduleofWeightedAverageNumberofSharesDetails Summary of Significant Accounting Policies - Net Income per Share Schedule of Weighted Average Number of Shares (Details) Details 32 false false R33.htm 2409403 - Disclosure - Divestitures and Business Combinations - Narrative (Details) Sheet http://www.appfolio.com/role/DivestituresandBusinessCombinationsNarrativeDetails Divestitures and Business Combinations - Narrative (Details) Details 33 false false R34.htm 2410404 - Disclosure - Divestitures and Business Combinations - Purchase Price Allocation (Details) Sheet http://www.appfolio.com/role/DivestituresandBusinessCombinationsPurchasePriceAllocationDetails Divestitures and Business Combinations - Purchase Price Allocation (Details) Details 34 false false R35.htm 2411405 - Disclosure - Divestitures and Business Combinations - Pro Forma Information (Details) Sheet http://www.appfolio.com/role/DivestituresandBusinessCombinationsProFormaInformationDetails Divestitures and Business Combinations - Pro Forma Information (Details) Details 35 false false R36.htm 2414406 - Disclosure - Investment Securities and Fair Value Measurements - Schedule of Available-for-sale Securities (Details) Sheet http://www.appfolio.com/role/InvestmentSecuritiesandFairValueMeasurementsScheduleofAvailableforsaleSecuritiesDetails Investment Securities and Fair Value Measurements - Schedule of Available-for-sale Securities (Details) Details 36 false false R37.htm 2415407 - Disclosure - Investment Securities and Fair Value Measurements - Available-for-sale Investments, by Remaining Contract Maturity (Details) Sheet http://www.appfolio.com/role/InvestmentSecuritiesandFairValueMeasurementsAvailableforsaleInvestmentsbyRemainingContractMaturityDetails Investment Securities and Fair Value Measurements - Available-for-sale Investments, by Remaining Contract Maturity (Details) Details 37 false false R38.htm 2416408 - Disclosure - Investment Securities and Fair Value Measurements - Schedule of Sales, Calls and Maturities (Details) Sheet http://www.appfolio.com/role/InvestmentSecuritiesandFairValueMeasurementsScheduleofSalesCallsandMaturitiesDetails Investment Securities and Fair Value Measurements - Schedule of Sales, Calls and Maturities (Details) Details 38 false false R39.htm 2417409 - Disclosure - Investment Securities and Fair Value Measurements - Fair Value, Assets Measured on Recurring Basis (Details) Sheet http://www.appfolio.com/role/InvestmentSecuritiesandFairValueMeasurementsFairValueAssetsMeasuredonRecurringBasisDetails Investment Securities and Fair Value Measurements - Fair Value, Assets Measured on Recurring Basis (Details) Details 39 false false R40.htm 2420410 - Disclosure - Internal-Use Software Development Costs - Capitalized Computer Software (Details) Sheet http://www.appfolio.com/role/InternalUseSoftwareDevelopmentCostsCapitalizedComputerSoftwareDetails Internal-Use Software Development Costs - Capitalized Computer Software (Details) Details 40 false false R41.htm 2421411 - Disclosure - Internal-Use Software Development Costs - Narrative (Details) Sheet http://www.appfolio.com/role/InternalUseSoftwareDevelopmentCostsNarrativeDetails Internal-Use Software Development Costs - Narrative (Details) Details 41 false false R42.htm 2422412 - Disclosure - Internal-Use Software Development Costs - Capitalized Computer Software Future Amortization Expense (Details) Sheet http://www.appfolio.com/role/InternalUseSoftwareDevelopmentCostsCapitalizedComputerSoftwareFutureAmortizationExpenseDetails Internal-Use Software Development Costs - Capitalized Computer Software Future Amortization Expense (Details) Details 42 false false R43.htm 2425413 - Disclosure - Intangible Assets and Goodwill - Schedule of Finite-Lived Intangible Assets (Details) Sheet http://www.appfolio.com/role/IntangibleAssetsandGoodwillScheduleofFiniteLivedIntangibleAssetsDetails Intangible Assets and Goodwill - Schedule of Finite-Lived Intangible Assets (Details) Details 43 false false R44.htm 2426414 - Disclosure - Intangible Assets and Goodwill - Schedule of Finite-Lived Intangible Assets, Future Amortization Expense (Details) Sheet http://www.appfolio.com/role/IntangibleAssetsandGoodwillScheduleofFiniteLivedIntangibleAssetsFutureAmortizationExpenseDetails Intangible Assets and Goodwill - Schedule of Finite-Lived Intangible Assets, Future Amortization Expense (Details) Details 44 false false R45.htm 2427415 - Disclosure - Intangible Assets and Goodwill - Schedule of Goodwill (Details) Sheet http://www.appfolio.com/role/IntangibleAssetsandGoodwillScheduleofGoodwillDetails Intangible Assets and Goodwill - Schedule of Goodwill (Details) Details 45 false false R46.htm 2430416 - Disclosure - Leases - Narrative (Details) Sheet http://www.appfolio.com/role/LeasesNarrativeDetails Leases - Narrative (Details) Details 46 false false R47.htm 2431417 - Disclosure - Leases - Schedule of Components of Lease Expense (Details) Sheet http://www.appfolio.com/role/LeasesScheduleofComponentsofLeaseExpenseDetails Leases - Schedule of Components of Lease Expense (Details) Details 47 false false R48.htm 2432418 - Disclosure - Leases - Schedule of Minimum Lease Payments Under Leases (Details) Sheet http://www.appfolio.com/role/LeasesScheduleofMinimumLeasePaymentsUnderLeasesDetails Leases - Schedule of Minimum Lease Payments Under Leases (Details) Details 48 false false R49.htm 2435419 - Disclosure - Long-Term Debt - Narrative (Details) Sheet http://www.appfolio.com/role/LongTermDebtNarrativeDetails Long-Term Debt - Narrative (Details) Details 49 false false R50.htm 2436420 - Disclosure - Long-Term Debt - Summary of Long-term Debt (Details) Sheet http://www.appfolio.com/role/LongTermDebtSummaryofLongtermDebtDetails Long-Term Debt - Summary of Long-term Debt (Details) Details 50 false false R51.htm 2438421 - Disclosure - Commitments and Contingencies (Details) Sheet http://www.appfolio.com/role/CommitmentsandContingenciesDetails Commitments and Contingencies (Details) Details http://www.appfolio.com/role/CommitmentsandContingencies 51 false false R52.htm 2440422 - Disclosure - Share Repurchase Program (Details) Sheet http://www.appfolio.com/role/ShareRepurchaseProgramDetails Share Repurchase Program (Details) Details http://www.appfolio.com/role/ShareRepurchaseProgram 52 false false R53.htm 2443423 - Disclosure - Stock-Based Compensation - Stock Option Activity (Details) Sheet http://www.appfolio.com/role/StockBasedCompensationStockOptionActivityDetails Stock-Based Compensation - Stock Option Activity (Details) Details 53 false false R54.htm 2444424 - Disclosure - Stock-Based Compensation - Restricted Stock Units Activity (Details) Sheet http://www.appfolio.com/role/StockBasedCompensationRestrictedStockUnitsActivityDetails Stock-Based Compensation - Restricted Stock Units Activity (Details) Details 54 false false R55.htm 2445425 - Disclosure - Stock-Based Compensation - Restricted Stock Units (Details) Sheet http://www.appfolio.com/role/StockBasedCompensationRestrictedStockUnitsDetails Stock-Based Compensation - Restricted Stock Units (Details) Details 55 false false R56.htm 2446426 - Disclosure - Stock-Based Compensation - Restricted Stock Awards (Details) Sheet http://www.appfolio.com/role/StockBasedCompensationRestrictedStockAwardsDetails Stock-Based Compensation - Restricted Stock Awards (Details) Details 56 false false R57.htm 2448427 - Disclosure - Income Taxes (Details) Sheet http://www.appfolio.com/role/IncomeTaxesDetails Income Taxes (Details) Details http://www.appfolio.com/role/IncomeTaxes 57 false false R58.htm 2451428 - Disclosure - Revenue and Other Information (Details) Sheet http://www.appfolio.com/role/RevenueandOtherInformationDetails Revenue and Other Information (Details) Details http://www.appfolio.com/role/RevenueandOtherInformationTables 58 false false R9999.htm Uncategorized Items - appf-20200930.htm Sheet http://xbrl.sec.gov/role/uncategorizedFacts Uncategorized Items - appf-20200930.htm Cover 59 false false All Reports Book All Reports appf-20200930.htm a93020exhibit311.htm a93020exhibit312.htm a93020exhibit321.htm appf-20200930.xsd appf-20200930_cal.xml appf-20200930_def.xml appf-20200930_lab.xml appf-20200930_pre.xml http://xbrl.sec.gov/dei/2019-01-31 http://fasb.org/us-gaap/2020-01-31 http://fasb.org/srt/2020-01-31 true true