Revenue from Contracts with Customers (Tables)

9 Months Ended

Sep. 30, 2022

Revenue From Contract With Customer [Abstract]

Summary of Product and Service Revenue Disaggregated by Geographic Region

The following table summarizes the Company’s product and service revenue disaggregated by geographic region, which is determined based on customer location, for the three and nine months ended September 30, 2022 and 2021:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2022		2021		2022		2021
United States	$	4,367	$	3,521	$	12,434	$	10,901
South Korea		74		1,165		2,170		3,353
Europe		805		908		3,380		2,718
Asia (excluding South Korea)		932		1,278		2,483		2,453
Other		98		115		373		276
Total1	$	6,276	$	6,987	$	20,840	$	19,701

1.The table above does not include lease revenue of $1,472 and $1,285 for three months ended September 30, 2022 and 2021, respectively, and $4,286 and $3,536 for the nine months ended September 30, 2022 and 2021, respectively. Substantially all lease revenue originates from the United States. Refer to Note 5, Leases.

Summary of Information about Receivables and Contract Liabilities from Contracts with Customers

The following table provides information about receivables and contract liabilities from contracts with customers:

	Classification	As of September 30, 2022		As of December 31, 2021
Accounts receivable, current	Accounts receivable, net	$	3,560	$	4,638
Notes receivable, current	Notes receivable, net	$	126	$	350
Notes receivable, long-term	Notes and other receivables, long-term, net	$	—	$	121
Contract asset, current	Prepaid and other current assets	$	26	$	—
Contract asset, long-term	Other assets	$	41	$	—
Deferred revenue, current	Deferred revenue	$	789	$	904
Deferred revenue, non-current	Other long-term liabilities	$	22	$	66
Contract liability, current	Other current liabilities	$	19	$	—

The following table provides information about contract assets from contracts with customers:

	Amount
Contract assets as of December 31, 2021	$	—
Contract assets recognized		70
Payments received		(3	)
Contract assets as of September 30, 2022	$	67

The following table provides information about contract liabilities from contracts with customers:

	Amount
Contract liabilities as of December 31, 2021	$	970
Billings not yet recognized as revenue		674
Beginning contract liabilities recognized as revenue		(814	)
Contract liabilities as of September 30, 2022	$	830
Contract liabilities as of December 31, 2020	$	1,051
Billings not yet recognized as revenue		784
Beginning contract liabilities recognized as revenue		(826	)
Contract liabilities as of September 30, 2021	$	1,009

Summary of Allowance for Accounts Receivable

The following table summarizes the activity in the allowance for accounts receivable:

	Amount
Accounts receivable, allowance for credit losses as of    December 31, 2021	$	47
Provision for credit losses		1
Write-offs		(17	)
Accounts receivable, allowance for credit losses as of    September 30, 2022	$	31
Accounts receivable, allowance for credit losses as of    December 31, 2020	$	19
Provision for credit losses		9
Write-offs		—
Accounts receivable, allowance for credit losses as of    September 30, 2021	$	28

Summary of Allowance for Notes Receivable

The following table summarizes the activity in the allowance for notes receivable:

	Amount
Notes receivable, allowance for credit losses as of    December 31, 2021	$	63
Provision for credit losses		(1	)
Write-offs		(59	)
Notes receivable, allowance for credit losses as of    September 30, 2022	$	3
Notes receivable, allowance for credit losses as of    December 31, 2020	$	18
Provision for credit losses		(6	)
Write-offs		—
Notes receivable, allowance for credit losses as of    September 30, 2021	$	12