Revenues

12 Months Ended

Dec. 31, 2021

Revenue from Contract with Customer [Abstract]

Revenues

Revenues

We generate the majority of our revenues by providing consulting services to our clients. See Note 1, "Description of Business and Summary of Significant Accounting Policies” for additional information on the types of consulting contract arrangements we provide.

Revenues are recognized when we satisfy a performance obligation by transferring services promised in a contract to a customer and in an amount that reflects the consideration that we expect to receive in exchange for those services. Performance obligations in our contracts represent distinct or separate services that we provide to our customers. If, at the outset of an arrangement, we determine that a contract with enforceable rights and obligations does not exist, revenues are deferred until all criteria for an enforceable contract are met.

Revenues recognized during the current period may include revenues from performance obligations satisfied or partially satisfied in previous periods. This primarily occurs when the estimated transaction price has changed based on our current probability assessment over whether the agreed-upon outcome for our performance-based and contingent arrangements will be achieved. The aggregate amount of revenues recognized related to a change in the transaction price in the current period, which related to performance obligations satisfied or partially satisfied in a prior period, was $26.3 million, $19.0 million and $28.9 million for the years ended December 31, 2021, 2020 and 2019, respectively.

Unfulfilled performance obligations primarily consist of fees not yet recognized on certain fixed-fee arrangements and performance-based and contingent arrangements. As of December 31, 2021 and 2020, the aggregate amount of the remaining contract transaction price allocated to unfulfilled performance obligations was $3.7 million and $8.5 million, respectively. We expect to recognize the majority of the related revenues over the next 24 months. We elected to utilize the optional exemption to exclude from this disclosure fixed-fee and performance-based and contingent arrangements with an original expected duration of one year or less and to exclude our time and expense arrangements for which revenues are recognized using the right-to-invoice practical expedient.

Contract assets are defined as assets for which we have recorded revenues but are not yet entitled to receive our fees because certain events, such as completion of the measurement period or client approval, must occur. The contract asset balance was $3.8 million and $2.6 million as of December 31, 2021 and 2020, respectively.

Contract liabilities are defined as liabilities incurred when we have received consideration but have not yet performed the agreed-upon services. This may occur when clients pay fees before work begins. The contract liability balance was immaterial as of December 31, 2021 and 2020.