| Document and Entity Information | Dec. 29, 2020 |
| Cover [Abstract] | |
| Amendment Flag | false |
| Entity Central Index Key | 0001689923 |
| Document Type | 8-K |
| Document Period End Date | Dec. 29, 2020 |
| Entity Registrant Name | ALTERYX, INC. |
| Entity Incorporation State Country Code | DE |
| Entity File Number | 001-38034 |
| Entity Tax Identification Number | 90-0673106 |
| Entity Address, Address Line One | 3345 Michelson Drive |
| Entity Address, Address Line Two | Suite 400 |
| Entity Address, City or Town | Irvine |
| Entity Address, State or Province | CA |
| Entity Address, Postal Zip Code | 92612 |
| City Area Code | (888) |
| Local Phone Number | 836-4274 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | Class A Common Stock, $0.0001 par value |
| Trading Symbol | AYX |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | false |
