3.20.1 html 218 365 1 false 60 0 false 5 false false R1.htm 0001000 - Document - Cover Page Sheet http://www.appfolio.com/role/CoverPage Cover Page Cover 1 false false R2.htm 1001000 - Statement - Condensed Consolidated Balance Sheets Sheet http://www.appfolio.com/role/CondensedConsolidatedBalanceSheets Condensed Consolidated Balance Sheets Statements 2 false false R3.htm 1001501 - Statement - Condensed Consolidated Balance Sheets (Parenthetical) Sheet http://www.appfolio.com/role/CondensedConsolidatedBalanceSheetsParenthetical Condensed Consolidated Balance Sheets (Parenthetical) Statements 3 false false R4.htm 1002000 - Statement - Condensed Consolidated Statements of Operations Sheet http://www.appfolio.com/role/CondensedConsolidatedStatementsOfOperations Condensed Consolidated Statements of Operations Statements 4 false false R5.htm 1003000 - 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 1004000 - 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 1005000 - 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 2101100 - Disclosure - Nature of Business Sheet http://www.appfolio.com/role/NatureOfBusiness Nature of Business Notes 8 false false R9.htm 2102100 - Disclosure - Summary of Significant Accounting Policies Sheet http://www.appfolio.com/role/SummaryOfSignificantAccountingPolicies Summary of Significant Accounting Policies Notes 9 false false R10.htm 2103100 - Disclosure - Business Combinations Sheet http://www.appfolio.com/role/BusinessCombinations Business Combinations Notes 10 false false R11.htm 2104100 - 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 2105100 - Disclosure - Internal-Use Software Development Costs Sheet http://www.appfolio.com/role/InternalUseSoftwareDevelopmentCosts Internal-Use Software Development Costs Notes 12 false false R13.htm 2106100 - Disclosure - Intangible Assets Sheet http://www.appfolio.com/role/IntangibleAssets Intangible Assets Notes 13 false false R14.htm 2107100 - Disclosure - Leases Sheet http://www.appfolio.com/role/Leases Leases Notes 14 false false R15.htm 2108100 - Disclosure - Long-Term Debt Sheet http://www.appfolio.com/role/LongTermDebt Long-Term Debt Notes 15 false false R16.htm 2109100 - Disclosure - Commitments and Contingencies Sheet http://www.appfolio.com/role/CommitmentsAndContingencies Commitments and Contingencies Notes 16 false false R17.htm 2110100 - Disclosure - Share Repurchase Program Sheet http://www.appfolio.com/role/ShareRepurchaseProgram Share Repurchase Program Notes 17 false false R18.htm 2111100 - Disclosure - Stock-Based Compensation Sheet http://www.appfolio.com/role/StockBasedCompensation Stock-Based Compensation Notes 18 false false R19.htm 2112100 - Disclosure - Income Taxes Sheet http://www.appfolio.com/role/IncomeTaxes Income Taxes Notes 19 false false R20.htm 2113100 - Disclosure - Revenue and Other Information Sheet http://www.appfolio.com/role/RevenueAndOtherInformation Revenue and Other Information Notes 20 false false R21.htm 2202201 - 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 2302302 - 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 2303301 - Disclosure - Business Combinations (Tables) Sheet http://www.appfolio.com/role/BusinessCombinationsTables Business Combinations (Tables) Tables http://www.appfolio.com/role/BusinessCombinations 23 false false R24.htm 2304301 - 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 2305301 - 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 2306301 - Disclosure - Intangible Assets (Tables) Sheet http://www.appfolio.com/role/IntangibleAssetsTables Intangible Assets (Tables) Tables http://www.appfolio.com/role/IntangibleAssets 26 false false R27.htm 2307301 - Disclosure - Leases (Tables) Sheet http://www.appfolio.com/role/LeasesTables Leases (Tables) Tables http://www.appfolio.com/role/Leases 27 false false R28.htm 2308301 - 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 2311301 - 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 2313301 - 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 2402403 - 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 31 false false R32.htm 2403402 - Disclosure - Business Combinations - Narrative (Details) Sheet http://www.appfolio.com/role/BusinessCombinationsNarrativeDetails Business Combinations - Narrative (Details) Details 32 false false R33.htm 2403403 - Disclosure - Business Combinations - Purchase Price Allocation (Details) Sheet http://www.appfolio.com/role/BusinessCombinationsPurchasePriceAllocationDetails Business Combinations - Purchase Price Allocation (Details) Details 33 false false R34.htm 2403404 - Disclosure - Business Combinations - Pro Forma Information (Details) Sheet http://www.appfolio.com/role/BusinessCombinationsProFormaInformationDetails Business Combinations - Pro Forma Information (Details) Details 34 false false R35.htm 2404402 - 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 35 false false R36.htm 2404403 - 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 36 false false R37.htm 2404404 - 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 37 false false R38.htm 2404405 - 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 38 false false R39.htm 2405402 - 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 39 false false R40.htm 2405403 - Disclosure - Internal-Use Software Development Costs - Narrative (Details) Sheet http://www.appfolio.com/role/InternalUseSoftwareDevelopmentCostsNarrativeDetails Internal-Use Software Development Costs - Narrative (Details) Details 40 false false R41.htm 2405404 - 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 41 false false R42.htm 2406402 - Disclosure - Intangible Assets - Schedule of Finite-Lived Intangible Assets (Details) Sheet http://www.appfolio.com/role/IntangibleAssetsScheduleOfFiniteLivedIntangibleAssetsDetails Intangible Assets - Schedule of Finite-Lived Intangible Assets (Details) Details 42 false false R43.htm 2406403 - Disclosure - Intangible Assets - Schedule of Finite-Lived Intangible Assets, Future Amortization Expense (Details) Sheet http://www.appfolio.com/role/IntangibleAssetsScheduleOfFiniteLivedIntangibleAssetsFutureAmortizationExpenseDetails Intangible Assets - Schedule of Finite-Lived Intangible Assets, Future Amortization Expense (Details) Details 43 false false R44.htm 2407402 - Disclosure - Leases - Narrative (Details) Sheet http://www.appfolio.com/role/LeasesNarrativeDetails Leases - Narrative (Details) Details 44 false false R45.htm 2407403 - 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 45 false false R46.htm 2407404 - 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 46 false false R47.htm 2408402 - Disclosure - Long-Term Debt - Narrative (Details) Sheet http://www.appfolio.com/role/LongTermDebtNarrativeDetails Long-Term Debt - Narrative (Details) Details 47 false false R48.htm 2408403 - 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 48 false false R49.htm 2408404 - Disclosure - Long-Term Debt - Schedule of Principal Payments for Term Loan (Details) Sheet http://www.appfolio.com/role/LongTermDebtScheduleOfPrincipalPaymentsForTermLoanDetails Long-Term Debt - Schedule of Principal Payments for Term Loan (Details) Details 49 false false R50.htm 2409401 - Disclosure - Commitments and Contingencies (Details) Sheet http://www.appfolio.com/role/CommitmentsAndContingenciesDetails Commitments and Contingencies (Details) Details http://www.appfolio.com/role/CommitmentsAndContingencies 50 false false R51.htm 2410401 - Disclosure - Share Repurchase Program (Details) Sheet http://www.appfolio.com/role/ShareRepurchaseProgramDetails Share Repurchase Program (Details) Details http://www.appfolio.com/role/ShareRepurchaseProgram 51 false false R52.htm 2411402 - Disclosure - Stock-Based Compensation - Stock Option Activity (Details) Sheet http://www.appfolio.com/role/StockBasedCompensationStockOptionActivityDetails Stock-Based Compensation - Stock Option Activity (Details) Details 52 false false R53.htm 2411404 - 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 53 false false R54.htm 2411405 - Disclosure - Stock-Based Compensation - Restricted Stock Units (Details) Sheet http://www.appfolio.com/role/StockBasedCompensationRestrictedStockUnitsDetails Stock-Based Compensation - Restricted Stock Units (Details) Details 54 false false R55.htm 2411406 - Disclosure - Stock-Based Compensation - Restricted Stock Awards (Details) Sheet http://www.appfolio.com/role/StockBasedCompensationRestrictedStockAwardsDetails Stock-Based Compensation - Restricted Stock Awards (Details) Details 55 false false R56.htm 2412401 - Disclosure - Income Taxes (Details) Sheet http://www.appfolio.com/role/IncomeTaxesDetails Income Taxes (Details) Details http://www.appfolio.com/role/IncomeTaxes 56 false false R57.htm 2413402 - 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 57 false false R9999.htm Uncategorized Items - appf3312010-q.htm Sheet http://xbrl.sec.gov/role/uncategorizedFacts Uncategorized Items - appf3312010-q.htm Cover 58 false false All Reports Book All Reports appf3312010-q.htm a33120exhibit311.htm a33120exhibit312.htm a33120exhibit321.htm appf-20200331.xsd appf-20200331_cal.xml appf-20200331_def.xml appf-20200331_lab.xml appf-20200331_pre.xml http://fasb.org/us-gaap/2019-01-31 http://fasb.org/srt/2019-01-31 http://xbrl.sec.gov/dei/2019-01-31 true true