"It is reasonably possible that changes in judgments ... could cause the company to consider some portion or all of the remaining goodwill of the Tumblr reporting unit to become impaired," Yahoo said in a regulatory filing on Monday.
Yahoo said on Friday it would take pretax charges of $64 million (roughly Rs. 436 crores) to $78 million (roughly Rs. 532 crores), mostly in the first quarter of 2016, due to job cuts and other restructuring moves.
Of the total, $40 million to $48 million (roughly Rs. 273 crores to Rs. 327 crores) would be for severance pay and related cash expenditures, the company said in a filing.
Yahoo has said it would reduce workforce by 15 percent by the end of 2016 and close offices in Dubai, Mexico City, Buenos Aires, Madrid and Milan.
The company's shares closed up 1.3 percent at $31.79 on Monday and were largely unchanged in extended trading.
© Thomson Reuters 2016