Inside Mobile Apps reports that Ngmoco, the mobile social gaming company acquired by DeNA in 2010, is laying off a number of its employees, having failed to rollout the Japanese company’s Mobage platform into Western markets as anticipated.

According to the report, the “technical complexity” of rolling out Mobage internationally meant that Ngmoco was not able to meet its first earnout deadline. In addition, a growing headcount in the US and China has eaten into DeNA’s profits.

The rollout of Mobage into international markets was announced in August 2011, alongside a push into China. It also inked a deal to work with AT&T in the US market.

A launch of Mobage in South Korea is anticipated imminently.