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Leases - Additional Information (Details) $ in Thousands	3 Months Ended		12 Months Ended
	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2024 USD ($) floor asset_group	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Leases [Abstract]
Renewal term (in years)			10 years
Sublease income			$ 1,300	$ 1,300	$ 400
Lease impairment charges	$ 0	$ 0	$ 5,462	0	0
Number of asset groups impaired | asset_group			2
Number of floors represented by each asset group within headquarters | floor			2
Reimbursements received for tenant improvements			$ 0	$ 2,600	$ 2,600

X

- Definition

Number Of Asset Groups Impaired

+ References

No definition available.

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X

- Definition

Number Of Floors

+ References

No definition available.

+ Details

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X

- Definition

Tenant Improvements, Reimbursements Received

+ References

No definition available.

+ Details

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Namespace Prefix:	appn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- References

No definition available.

+ Details

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X

- Definition

Term of lessee's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478964/842-20-50-3

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Balance Type:	na
Period Type:	instant

X

- Definition

Amount of loss from impairment of right-of-use asset from operating lease.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 25
-Paragraph 6
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479365/842-20-25-6

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X

- Definition

Amount of sublease income excluding finance and operating lease expense.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 53
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479589/842-20-55-53

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478964/842-20-50-4

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Period Type:	duration