Total revenue increased by $55.9 million for the year ended December 31, 2021 compared to the year ended December 31, 2020. The revenue growth was primarily attributable to an increase in subscription revenue of $55.2 million, discussed further below. The remaining growth was attributable to an increase in professional services and other revenue of $0.7 million primarily due to an increase in event sponsorship revenue from our live Identiverse conference in the second quarter of 2021, which was conducted virtually in the prior year as a result of COVID-19.
The table below sets forth the components of subscription revenue for the years ended December 31, 2021 and 2020.
Subscription revenue increased 25%, or $55.2 million, in the year ended December 31, 2021 compared to the year ended December 31, 2020. Total subscription revenue increased as a result of a greater amount of new and renewing subscriptions in the year ended December 31, 2021 compared to the year ended December 31, 2020. Remaining changes in subscription revenue were due to the changes in subscription type and duration, described further below.
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