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Revenue from Contracts with Customers
12 Months Ended
Dec. 31, 2021
Revenue from Contract with Customer [Abstract]  
Revenue from Contracts with Customers Revenue from Contracts with Customers
The following table summarizes the activity in deferred revenue:

Year Ended December 31,
20212020
Deferred revenue, beginning of year$59 $60 
Cumulative adjustment for adoption of ASC 606— 
Deferred revenue, beginning of year, as adjusted$59 $67 
Deferred revenue, end of period$56 $59 
Revenue recognized in the period from amounts included in deferred revenue at the beginning of period$43 $29 

As of December 31, 2021, $405 of revenue is expected to be recognized from remaining performance obligations for customer contracts. We expect to recognize revenue on approximately $389 of these remaining performance obligations over the next 24 months, with the balance recognized thereafter.

The following table summarizes the activity in deferred contract acquisition costs:

Year Ended December 31,
20212020
Beginning balance$29 $— 
Adjustment due to adoption of ASC 606— 19 
Capitalization of sales commissions costs56 25 
Amortization of sales commissions costs(30)(15)
Ending balance$55 $29 
Year Ended December 31,
20212020
Deferred costs, current
$30 $17 
Deferred costs, non-current
25 12 
Total
$55 $29