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Revenues
 12 Months Ended
Dec. 31, 2021
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.

The following table sets forth our total net revenues for the periods shown disaggregated for our Chegg Services and Required Materials product lines (in thousands, except percentages):

 Years Ended December 31,Change in 2021Change in 2020
 202120202019$%$%
Chegg Services$669,894 $521,228 $332,221 $148,666 29 %$189,007 57 %
Required Materials106,371 123,110 78,705 (16,739)(14)44,405 56 
Total net revenues$776,265 $644,338 $410,926 $131,927 20 $233,412 57 

During the years ended December 31, 2021, 2020, and 2019, we recognized $32.6 million, $18.3 million and $17.0 million, respectively, of revenues that were included in our deferred revenue balance at the beginning of each respective fiscal year. 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 due to a change in the estimated variable consideration ascribed to Thinkful. During the year ended December 31, 2020, we recognized an immaterial amount from performance obligations satisfied in previous periods. During the year ended December 31, 2019, we recognized $3.4 million of previously deferred revenues recognized from performance obligations satisfied in previous periods related to variable consideration recognized from our agreement with our Required Materials print textbook partner. During the years ended December 31, 2021 and 2020, we recognized $34.6 million and $50.8 million, respectively, of operating lease income from print textbook rentals that we own.

Contract Balances

The following table presents our accounts receivable, net, contract assets, and deferred revenue balances (in thousands, except percentages):
 December 31,Change
 20212020$%
Accounts receivable, net$17,850 $12,913 $4,937 38 %
Contract assets14,231 13,243 988 7 
Deferred revenue35,143 32,620 2,523 8 

During the year ended December 31, 2021, our accounts receivable, net balance increased by $4.9 million, or 38%, primarily due to timing of billings and seasonality of our business. During the year ended December 31, 2021, our contract assets balance increased by $1.0 million or 7%, primarily due to our Thinkful service. During the year ended December 31, 2021, our deferred revenue balance increased by $2.5 million, or 8%, primarily due to increased bookings and seasonality of our business.