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Revenues
 12 Months Ended
Dec. 31, 2023
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 presents our total net revenues for the periods shown disaggregated for our Subscription Services and Skills and Other product lines (in thousands, except percentages):

 Years Ended December 31,Change in 2023Change in 2022
 202320222021$%$%
Subscription Services$640,520 $671,968 $616,817 $(31,448)(5)%$55,151 9 %
Skills and Other75,775 94,929 159,448 (19,154)(20)(64,519)(40)
Total net revenues$716,295 $766,897 $776,265 $(50,602)(7)$(9,368)(1)

During the years ended December 31, 2023, 2022, and 2021, we recognized $54.5 million, $33.9 million and $32.6 million, respectively, of revenues that were included in our deferred revenue balance at the beginning of each respective fiscal year. During the years ended December 31, 2023, and 2022, we recognized an immaterial amount of revenues from performance obligations satisfied in previous periods. During the year ended December 31, 2021, we recognized a reduction of revenues of $4.9 million from performance obligations satisfied in previous periods, primarily related to our Skills offering. As of December 31, 2023, the closing balance of deferred contract costs was $6.0 million, and we recognized $15.8 million of deferred contract cost amortization during the year ended December 31, 2023.
Contract Balances

The following table presents our accounts receivable, net, contract assets, and deferred revenue balances (in thousands, except percentages):
 December 31,Change
 20232022$%
Accounts receivable, net$31,404 $23,515 $7,889 34 %
Contract assets8,598 11,946 (3,348)(28)
Deferred revenue55,336 56,273 (937)(2)

During the year ended December 31, 2023, our accounts receivable, net balance increased by $7.9 million, or 34%, primarily due to timing of billings and seasonality of our business. During the year ended December 31, 2023, our contract assets balance decreased by $3.3 million or 28%, primarily due to our Skills offering. During the year ended December 31, 2023, our deferred revenue balance decreased by $0.9 million, or 2%, primarily due to timing of bookings and seasonality of our business.