Revenue from Contracts with Customers (Tables)

12 Months Ended

Dec. 31, 2023

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 years ended December 31, 2023 and 2022:

	Year Ended December 31,
	2023		2022
United States	$	25,262	$	18,776
South Korea		257		2,180
Europe		5,585		4,409
Asia (excluding South Korea)		3,836		3,576
Other		776		502
Total1	$	35,716	$	29,443

1 The table above does not include lease revenue of $6,448 and $5,915 for the years ended December 31, 2023 and 2022, respectively. 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:

		As of December 31,
	Classification	2023		2022
Accounts receivable, current	Accounts receivable, net	$	4,001	$	6,040
Notes receivable, current	Notes receivable, net	$	323	$	200
Notes receivable, long-term	Notes and other receivables, long-term, net	$	1,279	$	442
Contract asset, current	Prepaid and other current assets	$	982	$	332
Deferred revenue, current	Deferred revenue	$	1,349	$	768
Deferred revenue, non-current	Other long-term liabilities	$	350	$	17
Contract liability, long-term	Other long-term liabilities	$	220	$	150

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		822
Beginning contract liabilities recognized as revenue		(857	)
Contract liabilities at December 31, 2022		935
Billings not yet recognized as revenue		1,847
Beginning contract liabilities recognized as revenue		(863	)
Contract liabilities at December 31, 2023	$	1,919

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
Change in provision for credit losses		26
Write-offs		(17	)
Accounts receivable, allowance for credit losses as of    December 31, 2022		56
Change in provision for credit losses		6
Write-offs		—
Accounts receivable, allowance for credit losses as of    December 31, 2023	$	62

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
Change in provision for credit losses		10
Write-offs		(60	)
Notes receivable, allowance for credit losses as of    December 31, 2022		13
Change in provision for credit losses		20
Write-offs		—
Notes receivable, allowance for credit losses as of    December 31, 2023	$	33

Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block]

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

		As of December 31,
	Classification	2023		2022
Accounts receivable, current	Accounts receivable, net	$	4,001	$	6,040
Notes receivable, current	Notes receivable, net	$	323	$	200
Notes receivable, long-term	Notes and other receivables, long-term, net	$	1,279	$	442
Contract asset, current	Prepaid and other current assets	$	982	$	332
Deferred revenue, current	Deferred revenue	$	1,349	$	768
Deferred revenue, non-current	Other long-term liabilities	$	350	$	17
Contract liability, long-term	Other long-term liabilities	$	220	$	150

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		822
Beginning contract liabilities recognized as revenue		(857	)
Contract liabilities at December 31, 2022		935
Billings not yet recognized as revenue		1,847
Beginning contract liabilities recognized as revenue		(863	)
Contract liabilities at December 31, 2023	$	1,919

Summary of Maturities of Notes Receivables Net Under Extended Payment Terms

Maturities of notes receivables, net under extended payment terms with a significant financing component as of December 31, 2023 are as follows:

Fiscal Year	Amount
2024		432
2025		432
2026		432
2027		386
2028		185
Thereafter		14
Total undiscounted cash flows		1,881
Present value of notes receivable		1,635
Difference between undiscounted and discounted    cash flows	$	246

Contract Assets – The Company's contract assets represent revenue recognized for performance obligations completed before an unconditional right to payment exists, and therefore invoicing has not yet occurred. The Company classifies contract assets in Prepaid and other current assets in the Company's balance sheets.
 

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

	Amount
Contract assets at December 31, 2021	$	—
Contract assets recognized		355
Payments received		(23	)
Contract assets at December 31, 2022		332
Contract assets recognized		1,630
Payments received		(806	)
Write-offs due to contract modifications		(174	)
Contract assets at December 31, 2023	$	982

Summary of Costs to Obtain Customer Contracts

The following table provides information about the costs to obtain contracts associated with contracts with customers for the years ended December 31, 2023 and 2022:

	Year Ended December 31,
	2023			2022
Beginning balance	$	4		$	43
Additions		611			350
Amortization		(580	)		(389	)
Ending balance	$	35		$	4