The Company invested approximately $2.1 million and $3.5 million in Enfission during the three months andsix months ended June 30, 2019, respectively. The total administrative consulting services was $200,000 for the six monthsended June 30, 2019. This $200,000 amount charged to Enfission was recorded as a $100,000 reduction of general and administrative expenses and a $100,000 reduction of research and development expenses.

The Company also provided research and development consulting services and management services to Enfission. The total consulting services was $0.3 million and $0.2 million for each of the quarters ended June 30, 2019 and 2018, respectively, and $0.7 million and $0.6 million for the six months ended June 30, 2019 and 2018, respectively,recorded under the caption “Other income from joint venture” in the accompanying condensed consolidated statement of operations.

As of June 30, 2019, and December 31, 2018, the total receivable due from Enfission was approximately $0.5 million and $0.1 million, respectively, which represents consulting fees Lightbridge charged to Enfission and reimbursable expenses paid by Lightbridge on Enfission’s behalf.