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Revenues | 12 Months Ended
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Dec. 31, 2019
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 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 2019 |  | Change in 2018
| 2019 |  | 2018 |  | 2017 |  | $ |  | % |  | $ |  | %
Chegg Services | $ | 332,221 |  |  | $ | 253,985 |  |  | $ | 185,683 |  |  | $ | 78,236 |  |  | 31 | % |  | $ | 68,302 |  |  | 37 | %
Required Materials | 78,705 |  |  | 67,099 |  |  | 69,383 |  |  | 11,606 |  |  | 17 |  |  | (2,284 | ) |  | (3 | )
Total net revenues | $ | 410,926 |  |  | $ | 321,084 |  |  | $ | 255,066 |  |  | $ | 89,842 |  |  | 28 |  |  | $ | 66,018 |  |  | 26 |
During the year ended December 31, 2019, we recognized $17.0 million of revenues that were included in our deferred revenue balance as of December 31, 2018. During the year ended December 31, 2018, we recognized $11.7 million of revenues that were included in our deferred revenue balance as of December 31, 2017. 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. The aggregate amount of unsatisfied performance obligations is approximately $18.8 million as of December 31, 2019, 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 asset balances (in thousands, except percentages):
| December 31, |  | Change
| 2019 |  | 2018 |  | $ |  | %
Accounts receivable, net | $ | 11,529 |  |  | $ | 12,733 |  |  | $ | (1,204 | ) |  | (9 | )%
Deferred revenue | 18,780 |  |  | 17,418 |  |  | 1,362 |  |  | 8 |
Contract assets | 3,531 |  |  | 337 |  |  | 3,194 |  |  | n/m |
_______________________________________ n/m - not meaningful During the year ended December 31, 2019, our accounts receivable, net balance decreased by $1.2 million, or 9%, primarily due to timing of billings partially offset by an improvement in cash collections. During the year ended December 31, 2019, our deferred revenue balance increased by $1.4 million, or 8%, primarily due to increased bookings for our Chegg Study service and eTextbook rentals driven by the seasonality of our business. During the year ended December 31, 2019, our contract assets balance increased by $3.2 million primarily due to variable consideration and payment arrangements for Thinkful.

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- Definition The entire disclosure of revenue from contract with customer to transfer good or service and to transfer nonfinancial asset. Includes, but is not limited to, disaggregation of revenue, credit loss recognized from contract with customer, judgment and change in judgment related to contract with customer, and asset recognized from cost incurred to obtain or fulfill contract with customer. Excludes insurance and lease contracts. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -URI http://asc.fasb.org/topic&trid=49130388 + Details
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