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Revenue (Tables)
6 Months Ended
Jun. 30, 2022
Revenue from Contract with Customer [Abstract]  
Disaggregation of Revenue
The following table sets forth our net revenues by category:

Three Months Ended June 30,Six Months Ended June 30,
2022202120222021
Platform revenue$1,628 $1,436 $4,120 $3,082 
Hardware revenue3,857 — 8,143 — 
Net revenues$5,485 $1,436 $12,263 $3,082 
Schedules of Concentration Risk
The following table sets forth our concentration of accounts receivable, net of specific allowances for doubtful accounts.
June 30, 2022December 31, 2021
Customer A12 %— %
Customer B10 %— %
Customer C%18 %
Customer D— %20 %
The following table sets forth our concentration of revenue sources as a percentage of total net revenues:

Three Months Ended June 30,Six Months Ended June 30,
2022202120222021
Customer E%%%11 %
Customer F— %21 %— %19 %
Customer G— %13 %— %11 %
Deferred Revenue
Our deferred revenue balance consisted of the following:
June 30, 2022December 31, 2021
Current deferred revenue
Platform revenue$1,616 $1,824 
Hardware revenue99 2,149 
Total current deferred revenue$1,715 $3,973 
Non-current deferred revenue
Platform revenue$859 $1,299 
Total non-current deferred revenue$859 $1,299 
Total deferred revenue$2,574 $5,272