Provision for Income Taxes Nine Months Ended  September 30, Change 2021 2020 $ % (in thousands, except percentages) Provision for income taxes $ 110 $ 142 $ (32) (22.5) % Percentage of total revenue 0.1 % 0.2 % Provision for income taxes primarily consists of state income taxes for the nine months ended September 30, 2021 and 2020. We maintain a full valuation allowance on our net federal and state deferred tax assets as we have concluded that it is not more likely than not that the deferred tax assets will be realized. 39