15. Contingent liabilities
On February 28, 2018, the Group’s board of directors awarded Dr. Lumsden a cash bonus of $127,500 for his performance and contributions during 2017. A portion, or $42,500, of the cash bonus is contingent upon achieving certain operational milestones in 2018. Dr. Lumsden received a separate supplemental bonus of $50,000 that is also contingent upon operational milestones in the first half of 2018. Dr. Huang was awarded a cash bonus of $142,000 for his performance and contributions in 2017. A portion, or $42,000, of the cash bonus is contingent upon achieving certain operational milestones in 2018.