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Net Loss Per Share - Schedule of Basic and Diluted Net Loss Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]    
Net loss $ (32,651) $ (4,959)
Less: net loss attributable to non-controlling interests (8,635)  
Net loss attributable to OneStream, Inc. $ (24,016) $ (4,959)
Class A and Class D common stock    
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]    
Weighted-average shares of Class A and Class D common stock outstanding-basic [1] 174,729  
Weighted-average shares of Class A and Class D common stock outstanding-diluted [1] 174,729  
Net loss per share of Class A and Class D common stock-basic $ (0.14)  
Net loss per share of Class A and Class D common stock-diluted $ (0.14)  
[1] Represents net loss per share of Class A common stock and Class D common stock and weighted-average shares of Class A common stock and Class D common stock outstanding for the applicable periods following the Reorganization Transactions as described in Note 1, Organization and Description of Business. Refer to Note 11, Net Loss per Share, in the accompanying notes for additional details.