Organization and description of business (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2026
Forecast | Coursera, Inc.
Product Information [Line Items]
Merger, potential termination fee		$ 40.5
Expense reimbursement		$ 8.0
Forecast | Coursera Stockholders
Product Information [Line Items]
Merger, shareholders ownership, percentage		59.00%
Forecast | Udemy Stockholders
Product Information [Line Items]
Merger, shareholders ownership, percentage		41.00%
Common Stock | Forecast | Coursera, Inc.
Product Information [Line Items]
Merger exchange ratio (in dollar per share)		$ 0.800
Merger, par value of common stock acquired, (in dollars per share)		$ 0.00001
General and administrative | Coursera, Inc.
Product Information [Line Items]
Acquisition costs	$ 3.7