Revenue (Tables)

6 Months Ended

Jun. 30, 2021

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,
	2021		2020		2021		2020
Net Revenues
Platform subscriptions and services	$	1,180	$	2,023	$	2,701	$	4,414
Application transaction	256		190		381		439
Net revenues	$	1,436	$	2,213	$	3,082	$	4,853

Schedules of Concentration Risk

The following table sets forth our concentration of accounts receivable, net of specific allowances for doubtful accounts.

	June 30, 2021		December 31, 2020
Customer A	23	%	16	%
Customer B	15	%	—	%
Customer C	—	%	55	%
Customer D	—	%	13	%

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,
	2021		2020		2021		2020
Customer E	—	%	36	%	1	%	33	%
Customer F	21	%	13	%	19	%	12	%
Customer G	13	%	11	%	12	%	10	%
Customer H	6	%	—	%	11	%	—	%

Deferred Revenue

Our deferred revenue balance consisted of the following:

	June 30, 2021		December 31, 2020
Current deferred revenue
Platform subscriptions and services revenue	$	1,927	$	2,317
Application transaction revenue	83		80
Total current deferred revenue	$	2,010	$	2,397
Non-current deferred revenue
Platform subscriptions and services revenue	$	1,779	$	2,678
Total non-current deferred revenue	$	1,779	$	2,678
Total deferred revenue	$	3,789	$	5,075