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REVENUE (Tables)
9 Months Ended
Sep. 30, 2021
Revenue from Contract with Customer [Abstract]  
Disaggregation of Revenue
The following table provides information on the disaggregation of revenue as recorded in the consolidated statements of operations (in thousands):
Three Months Ended
September 30,
Nine Months Ended
September 30,
2021202020212020
Partnership hardware revenue
$34,886$5,523$59,609$6,950
Partnership service revenue
33112
Host customer service revenue
4,9143,64914,87010,711
Total revenue
$39,833$9,172$74,591$17,661
Remaining Performance Obligations As of September 30, 2021, the Company had $207.2 million of remaining performance obligations, and the approximate percentages expected to be recognized as revenue in the future are as follows (in thousands, except percentages):
Total remaining
performance
obligations
Percent Expected to be Recognized as Revenue
Less than
one year
Two to
five years
Greater than
five years

Service revenue
$157,494 12 %48 %40 %
Hardware revenue
49,738 100 %— %— %
Total revenue$207,232 
Contract Balances The following table presents the changes in the deferred revenue balance during the nine months ended September 30, 2021 (in thousands):
Beginning balance as of January 1, 2021$52,410 
Upfront payments received from customers36,652 
Upfront or annual incentive payments received4,575 
Revenue recognized related to amounts that were included in beginning balance of deferred revenue(32,139)
Revenue recognized related to deferred revenue generated during the period(12,626)
Ending balance as of September 30, 2021$48,872