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Revenues
 9 Months Ended
Sep. 30, 2020
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, most significantly the revenue share we earn from our print textbook partners, being recognized at the point in time when print textbooks are shipped to students.
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
 20202019$%
Chegg Services$118,895 $69,304 $49,591 72 %
Required Materials35,123 24,847 10,276 41 
Total net revenues$154,018 $94,151 $59,867 64 

 Nine Months Ended September 30,Change
 20202019$%
Chegg Services$345,258 $224,903 $120,355 54 %
Required Materials93,359 60,519 32,840 54 
Total net revenues$438,617 $285,422 $153,195 54 

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, 2019, we recognized $15.7 million and $16.0 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, 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, 2019, we recognized $2.2 million and $2.7 million, respectively, 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 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. The aggregate amount of unsatisfied performance obligations is approximately $51.9 million as of September 30, 2020, which are expected to be recognized as revenues over the next year.

Contract Balances

The following table presents our accounts receivable, net, deferred revenue, and contract assets balances (in thousands, except percentages):
 Change
 September 30, 2020December 31, 2019$%
Accounts receivable, net$12,487 $11,529 $958 8 %
Deferred revenue51,941 18,780 33,161 177 
Contract assets8,214 3,531 4,683 133 

During the nine months ended September 30, 2020, our accounts receivable, net balance increased by $1.0 million, or 8%, primarily due to timing of billings and seasonality of our business. During the nine months ended September 30, 2020, our deferred revenue balance increased by $33.2 million, or 177%, primarily due to increased bookings driven by the seasonality of our business as well as from print textbooks that we own that are recognized ratably rather than immediately. During the nine months ended September 30, 2020, our contract assets balance increased by $4.7 million, or 133%, primarily due to deferred payment arrangements for Thinkful.