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Revenues
 12 Months Ended
Dec. 31, 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 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 2020Change in 2019
 202020192018$%$%
Chegg Services$521,228 $332,221 $253,985 $189,007 57 %$78,236 31 %
Required Materials123,110 78,705 67,099 44,405 56 11,606 17 
Total net revenues$644,338 $410,926 $321,084 $233,412 57 $89,842 28 

During the years ended December 31, 2020, 2019, and 2018, we recognized $18.3 million, $17.0 million and $11.7 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, 2020, we recognized an immaterial amount of previously deferred revenues recognized from performance obligation 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 year ended December 31, 2018, we recognized an immaterial amount of previously deferred revenues recognized from performance obligations satisfied in previous periods. During the year ended December 31, 2020, we recognized $50.8 million of operating lease income from print textbook rentals that we own. The aggregate amount of unsatisfied performance obligations is approximately $32.6 million as of December 31, 2020, which are expected to be recognized into 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):
 December 31,Change
 20202019$%
Accounts receivable, net$12,913 $11,529 $1,384 12 %
Deferred revenue32,620 18,780 13,840 74 
Contract assets13,243 3,531 9,712 275 

During the year ended December 31, 2020, our accounts receivable, net balance increased by $1.4 million, or 12%, primarily due to timing of billings. During the year ended December 31, 2020, our deferred revenue balance increased by $13.8
million, or 74%, primarily due to increased bookings driven by higher Chegg Services revenue and print textbooks that we own that are recognized ratably rather than immediately. During the year ended December 31, 2020, our contract assets balance increased by $9.7 million or 275%, primarily due to the income sharing payment arrangements we offer to students for our Thinkful service.