Penguin Random House has sold off controversial self-publishing arm Author Solutions.

The division has been sold to private investment firm, the Najafi Companies. Terms of the deal, which closed December 31, were not disclosed.

In a brief letter to employees, PRH CEO Markus Dohle explained that the sale will “reaffirm our focus on consumer book publishing through our 250 imprints worldwide, and our commitment to connecting our authors and their works to readers everywhere.”

Author Solutions was acquired by Penguin parent company Pearson in 2012 and became part of PRH following the 2013 merger of Random House and Penguin. A class action lawsuit against Author Solutions was filed in the summer of 2013 by several authors who charged the company with fraud. The case was dismissed in late 2015.

Author Solutions has helped over 200,000 authors publish about 250,000 titles. In addition to providing services to help authors produce a book, Author Solutions offers a range of services including cover design, editing, and marketing and publicity.