The owner of adultery website Ashley Madison had already been struggling to sell itself or raise funds for at least three years before the publication of details about its members, according to internal documents and emails also released by hackers as part of their assault on the company in recent weeks. Avid Life Media announced on Friday that CEO Noel Biderman, who founded the website in 2001, had left the company with immediate effect, the latest sign of the wrenching impact on the company of the attack that led to the disclosure of sensitive data about millions of clients.