Revenue from Contracts with Customers (Tables)

3 Months Ended

Mar. 31, 2024

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 months ended March 31, 2024 and 2023:

	Three Months Ended March 31,
	2024		2023
United States	$	6,010	$	4,264
South Korea		278		9
Europe		1,415		1,538
Asia (excluding South Korea)		884		708
Other		54		104
Total1	$	8,641	$	6,623

1 The table above does not include lease revenue of $1,947 and $1,629 for the three months ended March 31, 2024 and 2023. Substantially all lease revenue originates from the United States. Refer to Note 6, 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 March 31, 2024		As of December 31, 2023
Accounts receivable, current	Accounts receivable, net	$	4,023	$	4,001
Notes receivable, current	Notes receivable, net	$	329	$	323
Notes receivable, long-term	Notes and other receivables, long-term, net	$	1,174	$	1,279
Contract asset, current	Prepaid and other current assets	$	785	$	982
Deferred revenue, current	Deferred revenue	$	1,582	$	1,349
Deferred revenue, non-current	Other long-term liabilities	$	321	$	350
Contract liability, long-term	Other long-term liabilities	$	214	$	220

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

	Amount
Contract assets as of December 31, 2023	$	982
Contract assets recognized		488
Payments received		(635	)
Write-off due to contract modification		(50	)
Contract assets as of March 31, 2024	$	785
Contract assets as of December 31, 2022	$	332
Contract assets recognized		117
Payments received		(45	)
Contract assets as of March 31, 2023	$	404

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

	Amount
Contract liabilities as of December 31, 2023	$	1,919
Billings not yet recognized as revenue		776
Beginning contract liabilities recognized as revenue		(578	)
Contract liabilities as of March 31, 2024	$	2,117
Contract liabilities as of December 31, 2022	$	935
Billings not yet recognized as revenue		823
Beginning contract liabilities recognized as revenue		(367	)
Contract liabilities as of March 31, 2023	$	1,391

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, 2023	$	62
Change in provision for credit losses		(18	)
Write-offs		—
Accounts receivable, allowance for credit losses as of    March 31, 2024	$	44
Accounts receivable, allowance for credit losses as of    December 31, 2022	$	56
Change in provision for credit losses		(13	)
Write-offs		—
Accounts receivable, allowance for credit losses as of    March 31, 2023	$	43

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, 2023	$	33
Change in provision for credit losses		(2	)
Write-offs		—
Notes receivable, allowance for credit losses as of    March 31, 2024	$	31
Notes receivable, allowance for credit losses as of    December 31, 2022	$	13
Change in provision for credit losses		7
Write-offs		—
Notes receivable, allowance for credit losses as of    March 31, 2023	$	20