XML 76 R65.htm IDEA: XBRL DOCUMENT
v3.22.2.2

Investments and Fair Value Measurements - Components of Investments (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Cost Basis | $ 41,191 | $ 105,546
Unrealized Gains (Losses) | (157) | (22)
Market Value | 41,034 | 105,524
Cash and Cash Equivalents |  |
Debt Securities, Available-for-sale [Line Items] |  |
Market Value | 149 | 38,301
Short-term Investments and Marketable Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Market Value | 40,885 | 55,179
Long-term Investments |  |
Debt Securities, Available-for-sale [Line Items] |  |
Market Value |  | 12,044
Level 1 | Money market fund |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost Basis | 149 | 38,301
Unrealized Gains (Losses) | 0 | 0
Market Value | 149 | 38,301
Level 1 | Money market fund | Cash and Cash Equivalents |  |
Debt Securities, Available-for-sale [Line Items] |  |
Market Value | 149 | 38,301
Level 1 | Money market fund | Short-term Investments and Marketable Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Market Value | 0 | 0
Level 1 | Money market fund | Long-term Investments |  |
Debt Securities, Available-for-sale [Line Items] |  |
Market Value |  | 0
Level 1 | U.S. Treasuries |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost Basis | 17,985 |
Unrealized Gains (Losses) | (70) |
Market Value | 17,915 |
Level 1 | U.S. Treasuries | Cash and Cash Equivalents |  |
Debt Securities, Available-for-sale [Line Items] |  |
Market Value | 0 |
Level 1 | U.S. Treasuries | Short-term Investments and Marketable Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Market Value | 17,915 |
Level 1 | U.S. Treasury bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost Basis |  | 8,171
Unrealized Gains (Losses) |  | 0
Market Value |  | 8,171
Level 1 | U.S. Treasury bonds | Cash and Cash Equivalents |  |
Debt Securities, Available-for-sale [Line Items] |  |
Market Value |  | 0
Level 1 | U.S. Treasury bonds | Short-term Investments and Marketable Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Market Value |  | 8,171
Level 1 | U.S. Treasury bonds | Long-term Investments |  |
Debt Securities, Available-for-sale [Line Items] |  |
Market Value |  | 0
Level 2 | Commercial paper |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost Basis | 13,134 | 23,312
Unrealized Gains (Losses) | 0 | 0
Market Value | 13,134 | 23,312
Level 2 | Commercial paper | Cash and Cash Equivalents |  |
Debt Securities, Available-for-sale [Line Items] |  |
Market Value | 0 | 0
Level 2 | Commercial paper | Short-term Investments and Marketable Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Market Value | 13,134 | 23,312
Level 2 | Commercial paper | Long-term Investments |  |
Debt Securities, Available-for-sale [Line Items] |  |
Market Value |  | 0
Level 2 | Corporate bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost Basis | 9,923 | 20,107
Unrealized Gains (Losses) | (87) | (14)
Market Value | 9,836 | 20,093
Level 2 | Corporate bonds | Cash and Cash Equivalents |  |
Debt Securities, Available-for-sale [Line Items] |  |
Market Value | 0 | 0
Level 2 | Corporate bonds | Short-term Investments and Marketable Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Market Value | $ 9,836 | 8,049
Level 2 | Corporate bonds | Long-term Investments |  |
Debt Securities, Available-for-sale [Line Items] |  |
Market Value |  | 12,044
Level 2 | Asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost Basis |  | 15,655
Unrealized Gains (Losses) |  | (8)
Market Value |  | 15,647
Level 2 | Asset-backed securities | Cash and Cash Equivalents |  |
Debt Securities, Available-for-sale [Line Items] |  |
Market Value |  | 0
Level 2 | Asset-backed securities | Short-term Investments and Marketable Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Market Value |  | 15,647
Level 2 | Asset-backed securities | Long-term Investments |  |
Debt Securities, Available-for-sale [Line Items] |  |
Market Value |  | $ 0

X
- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454 + Details
Name: | us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(6)) -URI https://asc.fasb.org/extlink&oid=126897435&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=124260329&loc=d3e26610-111562 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563 + Details
Name: | us-gaap_AvailableForSaleSecuritiesDebtSecurities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount, before tax, of unrealized gain (loss) in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References No definition available. + Details
Name: | us-gaap_DebtSecuritiesAvailableForSaleAccumulatedGrossUnrealizedGainLossBeforeTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_BalanceSheetLocationAxis=us-gaap_CashAndCashEquivalentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BalanceSheetLocationAxis=us-gaap_ShortTermInvestmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BalanceSheetLocationAxis=appn_LongTermInvestmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_MoneyMarketFundsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_USTreasurySecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_USTreasuryBondSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_CommercialPaperMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_CorporateDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_AssetBackedSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |