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REVENUE RECOGNITION
 12 Months Ended
Dec. 31, 2021
Revenue from Contract with Customer [Abstract]  
REVENUE RECOGNITION REVENUE RECOGNITION
See Note 19, Segment Information, for revenue summarized by reportable segment and category.
Contract Balances
Our deferred revenue relates to product sales and gift card revenue. Revenue for product sales is recognized as the products are delivered to customers, generally within two weeks following the balance sheet date, while revenue for gift cards is recognized upon customer redemption. Our deferred revenue was $3.5 million as of December 31, 2021. As of December 31, 2020 and 2019, our deferred revenue was $11.2 million and $18.0 million, all of which was recognized during the years ended December 31, 2021 and 2020, respectively.
Customer Credits
The following table summarizes the activity in the liability for customer credits for the years ended December 31, 2021 and 2020 (in thousands):
Customer Credits
Balance as of December 31, 2019$13,764 
Credits issued213,826 
Credits redeemed (1)
(147,096)
Breakage revenue recognized (2)
(21,364)
Foreign currency translation1,876 
Balance as of December 31, 2020$61,006 
Credits issued217,407 
Credits redeemed (1)
(178,720)
Breakage revenue recognized (2)
(41,800)
Foreign currency translation(1,335)
Balance as of December 31, 2021$56,558 
(1)Historically, customer credits have primarily been used within one year of issuance; however, usage patterns have been impacted from changes in customer behavior due to COVID-19.
(2)The increase in our breakage revenue recognized is largely due to a change in estimate due to lower customer usage patterns since the onset of COVID-19.
Cost of Obtaining Contracts
Deferred contract acquisition costs are presented in Prepaid expenses and other current assets and Other non-current assets on the consolidated balance sheets. As of December 31, 2021 and 2020, deferred contract acquisition costs were $8.0 million and $6.3 million.

The amortization of deferred contract acquisition costs is classified within Selling, general and administrative expense in the consolidated statements of operations. For the years ended December 31, 2021, 2020 and 2019, we amortized $10.5 million, $15.3 million and $20.4 million of deferred contract acquisition costs and did not recognize any impairment losses in relation to the deferred costs.
Allowance for Expected Credit Losses on Accounts Receivable
The following table summarizes the activity in the allowance for expected credit losses on accounts receivables for the year ended December 31, 2021 (in thousands):
Allowance for Expected Credit Losses
Balance as of December 31, 2019$3,693 
Change in provision9,631 
Write-offs(3,315)
Foreign currency translation(253)
Balance as of December 31, 2020$9,756 
Change in provision(28)
Write-offs(1,875)
Foreign currency translation121 
Balance as of December 31, 2021$7,974 
Variable Consideration for Unredeemed Vouchers
During the year ended December 31, 2021, we recognized $31.4 million of variable consideration from unredeemed vouchers that were sold in a prior year. We have observed redemption rates lower than our historical estimates for vouchers sold at the onset of the COVID-19 pandemic, the substantial majority of which reached expiration during the year ended December 31, 2021. Although redemption rates for vouchers sold in more recent periods have improved, the impact of COVID-19 on redemption behavior in future periods is still uncertain. When actual redemptions differ from our estimates, the effects could be material to the consolidated financial statements.