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Revenues
 9 Months Ended
Sep. 30, 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 tables set forth our total net revenues for the periods shown disaggregated for our Chegg Services and Required Materials product lines (in thousands, except percentages):
 Three Months Ended
September 30,		Change
 20212020$%
Chegg Services$146,790 $118,895 $27,895 23 %
Required Materials25,152 35,123 (9,971)(28)
Total net revenues$171,942 $154,018 $17,924 12 

 Nine Months Ended
September 30,		Change
 20212020$%
Chegg Services$482,654 $345,258 $137,396 40 %
Required Materials86,144 93,359 (7,215)(8)
Total net revenues$568,798 $438,617 $130,181 30 

During the three and nine months ended September 30, 2021, we recognized $31.3 million and $32.6 million, respectively, of revenues that were included in our deferred revenue balance at the beginning of each reporting period. During the three and nine months ended September 30, 2020, we recognized $25.4 million and $18.0 million, respectively, of revenues that were included in our deferred revenue balance at the beginning of each reporting period. During the three and nine months ended September 30, 2021, we recognized a reduction of revenues of an immaterial amount and $3.4 million, respectively, from performance obligations satisfied in previous periods primarily due to a change in the estimated variable consideration ascribed to Thinkful. During the three and nine months ended September 30, 2020, we recognized an immaterial amount of previously deferred revenues recognized from performance obligations satisfied in previous periods. During the three and nine months ended September 30, 2021, we recognized $6.2 million and $26.9 million, respectively, of operating lease income from print textbook rentals that we own. During the three and nine months ended September 30, 2020, we recognized $12.0 million and $35.4 million, respectively, of operating lease income from print textbook rentals that we own.

Contract Balances

The following table presents our accounts receivable, net, deferred revenue, and contract assets balances (in thousands, except percentages):
 Change
 September 30,
2021		December 31, 2020$%
Accounts receivable, net$9,302 $12,913 $(3,611)(28)%
Deferred revenue49,983 32,620 17,363 53 
Contract assets16,358 13,243 3,115 24 

During the nine months ended September 30, 2021, our accounts receivable, net balance decreased by $3.6 million, or 28%, primarily due to timing of billings and seasonality of our business. During the nine months ended September 30, 2021, our deferred revenue balance increased by $17.4 million, or 53%, primarily due to increased bookings and seasonality of our business. During the nine months ended September 30, 2021, our contract assets balance increased by $3.1 million, or 24%, primarily due to our Thinkful service.