https://www.gamespot.com/articles/despite-setting-a-2k-record-mafia-3-dev-hit-with-l/1100-6456811/
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The news was originally reported by Kotaku; sources speaking with the site indicated that a "large portion" of the studio's staff have been laid off. At least prior to Mafia III's release, Hangar 13's staff count was in the neighborhood of 150 people.
Mafia III was the debut game from Hangar 13, which was formed in 2014. (The first two titles were developed by Silver Wish Games, now known as 2K Czech.) Its next project had not been officially announced, though Mafia III itself was seemingly a success for the company. It shipped 4.5 million copies to retailers during its launch week, which was a new record for 2K at the time. By the end of March 2017, it had shipped 5 million units.