Revenue from Contracts with Customers (Tables)

12 Months Ended

Dec. 31, 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 years ended December 31, 2022 and 2021:

	Year Ended December 31,
	2022		2021
United States	$	18,776	$	15,004
South Korea		2,180		4,380
Europe		4,409		5,805
Asia (excluding South Korea)		3,576		3,855
Other		502		449
Total1	$	29,443	$	29,493

1 The table above does not include lease revenue of $5,915 and $4,966 for the years ended December 31, 2022 and 2021, respectively. 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:

		As of December 31,
	Classification	2022		2021
Accounts receivable, current	Accounts receivable, net	$	6,040	$	4,638
Notes receivable, current	Notes receivable, net	$	200	$	350
Notes receivable, long-term	Notes and other receivables, long-term, net	$	442	$	121
Contract asset, current	Prepaid and other current assets	$	332	$	—
Deferred revenue, current	Deferred revenue	$	768	$	904
Deferred revenue, non-current	Other long-term liabilities	$	17	$	66
Contract liability, long-term	Other long-term liabilities	$	150	$	—

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

	Amount
Contract liabilities as of December 31, 2020	$	1,051
Billings not yet recognized as revenue		798
Beginning contract liabilities recognized as revenue		(879	)
Contract liabilities at 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

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, 2020	$	19
Change in provision for credit losses		28
Write-offs		—
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

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, 2020	$	18
Change in provision for credit losses		45
Write-offs		—
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

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	2022		2021
Accounts receivable, current	Accounts receivable, net	$	6,040	$	4,638
Notes receivable, current	Notes receivable, net	$	200	$	350
Notes receivable, long-term	Notes and other receivables, long-term, net	$	442	$	121
Contract asset, current	Prepaid and other current assets	$	332	$	—
Deferred revenue, current	Deferred revenue	$	768	$	904
Deferred revenue, non-current	Other long-term liabilities	$	17	$	66
Contract liability, long-term	Other long-term liabilities	$	150	$	—

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

	Amount
Contract liabilities as of December 31, 2020	$	1,051
Billings not yet recognized as revenue		798
Beginning contract liabilities recognized as revenue		(879	)
Contract liabilities at 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

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, 2022 are as follows:

Fiscal Year	Amount
2023		230
2024		136
2025		136
2026		136
2027		112
Total undiscounted cash flows		750
Present value of notes receivable		655
Difference between undiscounted and discounted    cash flows	$	95

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

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, 2022 and 2021:

	Year Ended December 31,
	2022			2021
Beginning balance	$	43		$	109
Additions		350			509
Amortization		(389	)		(575	)
Ending balance	$	4		$	43