Revenue (Tables)

6 Months Ended

Jun. 30, 2021

Revenue from Contract with Customer [Abstract]

Disaggregation of Revenue

The following tables present revenue disaggregated by geography of the customer’s shipping location for the three and six months ended June 30, 2021 and 2020:

	Three Months Ended June 30,				Six Months Ended June 30,
	2021		2020		2021		2020
United States	$	2,300	$	607	$	3,877	$	1,445
Greater China	5,222		2,596		10,209		5,320
Rest of North America	623		194		1,227		358
South America	294		84		595		269
Rest of Asia Pacific	136		79		575		713
Europe	605		148		811		266
Total revenue	$	9,180	$	3,708	$	17,294	$	8,371

Schedule of Contract Liabilities

The following table presents the liabilities associated with the engineering services contracts as of June 30, 2021 and December 31, 2020:

	June 30, 2021		December 31, 2020
Deferred revenue	$	927	$	1,665

Schedules of Customers Accounting for More Than 10% of Total Revenue

As identified below, some of our customers accounted for more than 10% of our total revenue for the three and six months ended June 30, 2021 and 2020:

	Three Months Ended June 30,				Six Months Ended June 30,
	2021		2020		2021		2020
Customer A	38.5	%	51.0	%	45.8	%	62.6	%
Customer B	12.6	%	17.9	%	12.5	%	16.6	%
Customer C	10.9	%	—	%	5.8	%	—	%