The Company did not

record a provision for U.S. federal income taxes for the three months ended March 31, 2020 because it expects to generate a loss for the year ended December 31, 2020. The income tax expense for the three months ended March 31, 2020 represented foreign taxes, and the income tax benefit for the three months ended March 31, 2019 related to foreign research and development tax credits. The Company’s net U.S. deferred tax assets continue to be offset by a full valuation allowance.