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Revenues
 6 Months Ended
Jun. 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 June 30,Change
 20202019$%
Chegg Services$126,004  $80,307  $45,697  57 %
Required Materials27,005  13,555  13,450  99  
Total net revenues$153,009  $93,862  $59,147  63  

 Six Months Ended June 30,Change
 20202019$%
Chegg Services$226,363  $155,599  $70,764  45 %
Required Materials58,236  35,672  22,564  63  
Total net revenues$284,599  $191,271  $93,328  49  

During the three and six months ended June 30, 2020, we recognized $33.4 million and $17.8 million, respectively, of revenues that were included in our deferred revenue balance at the beginning of each reporting period. During the three and six months ended June 30, 2019, we recognized $19.9 million and $13.6 million, respectively, of revenues that were included in our deferred revenue balance at the beginning of each reporting period. During the three and six months ended June 30, 2020, we recognized an immaterial amount of previously deferred revenues recognized from performance obligations satisfied in previous periods. During the three and six months ended June 30, 2019, we recognized $0.7 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 three and six months ended June 30, 2020, we recognized $11.1 million and $23.4 million, respectively, of operating lease income from print textbook rentals that we own. The aggregate amount of unsatisfied performance obligations is approximately $28.3 million as of June 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
 June 30, 2020December 31, 2019$%
Accounts receivable, net$8,834  $11,529  $(2,695) (23)%
Deferred revenue28,320  18,780  9,540  51  
Contract assets4,742  3,531  1,211  34  

During the six months ended June 30, 2020, our accounts receivable, net balance decreased by $2.7 million, or 23%, primarily due to timing of billings and seasonality of our business. During the six months ended June 30, 2020, our deferred revenue balance increased by $9.5 million, or 51%, 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 six months ended June 30, 2020, our contract assets balance increased by $1.2 million, or 34%, primarily due to payment arrangements for Thinkful.