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Revenues
 12 Months Ended
Dec. 31, 2022
Revenue from Contract with Customer [Abstract]  
Revenues Revenues
Revenue Recognition

Revenues are recognized when control of the promised goods or services is transferred to our customers, in an amount that reflects the consideration we expect to be entitled to in exchange for those goods or services. The majority of our revenues are recognized over time as services are performed, with certain revenues being recognized at a point in time.

We have changed our revenue disaggregation to Subscription Services and Skills and Other to better reflect the nature and timing of revenue and cash flows. Subscription Services includes revenues from our Chegg Study Pack, Chegg Study, Chegg Writing, Chegg Math, and Busuu offerings. Skills and Other includes revenues from our Skills, advertising services, print textbooks and eTextbooks offerings. We no longer present our Required Materials product line separately as we no longer expect to have significant revenue from our print textbook and eTextbooks offerings due to recognizing a revenue share as a result of our partnership with GT.
The following table sets forth our total net revenues for the periods shown disaggregated for our Subscription Services and Skills and Other product lines (in thousands, except percentages):

 Years Ended December 31,Change in 2022Change in 2021
 202220212020$%$%
Subscription Services$671,968 $616,817 $460,612 $55,151 9 %$156,205 34 %
Skills and Other94,929 159,448 183,726 (64,519)(40)(24,278)(13)
Total net revenues$766,897 $776,265 $644,338 $(9,368)(1)$131,927 20 

During the years ended December 31, 2022, 2021, and 2020, we recognized $33.9 million, $32.6 million and $18.3 million, respectively, of revenues that were included in our deferred revenue balance at the beginning of each respective fiscal year. During the years ended December 31, 2022 and 2020, we recognized an immaterial amount from performance obligations satisfied in previous periods. During the year ended December 31, 2021, we recognized a reduction of revenues of $4.9 million from performance obligations satisfied in previous periods, primarily related to our Skills offering. During the years ended December 31, 2022, 2021 and 2020, we recognized $5.1 million, $34.6 million and $50.8 million, respectively, of operating lease income from print textbook rentals that we own. The decreases in operating lease income are primarily due to the transition of our print textbook and eTextbook offerings. For further information, refer to Note 7, “Required Materials Transition.”

Contract Balances

The following table presents our accounts receivable, net, contract assets, and deferred revenue balances (in thousands, except percentages):
 December 31,Change
 20222021$%
Accounts receivable, net$23,515 $17,850 $5,665 32 %
Contract assets11,946 14,231 (2,285)(16)
Deferred revenue56,273 35,143 21,130 60 

During the year ended December 31, 2022, our accounts receivable, net balance increased by $5.7 million, or 32%, primarily due to timing of billings and seasonality of our business. During the year ended December 31, 2022, our contract assets balance decreased by $2.3 million or 16%, primarily due to our Skills offering. During the year ended December 31, 2022, our deferred revenue balance increased by $21.1 million, or 60%, primarily due to acquired deferred revenue in conjunction with our acquisition of Busuu, increased bookings and seasonality of our business.