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Disaggregation of Revenue (Tables)

3 Months Ended

12 Months Ended

Mar. 31, 2024

Dec. 31, 2023

Organization and Liquidity

Schedule of disaggregation of revenues from contracts with customers and categorized by customer location

Disaggregation of revenues from contracts with customers is as follows (in thousands):

​	​	​	​	​	​	​	​	​	​
​		Three Months Ended March 31, 2024
​		Product Revenues			Service Revenues			Total
Timing of revenue recognition	​	​			​			​
At a point in time	​	$	2,378	​	$	—	​	$	2,378
Over time	​		—	​		887	​		887
Total	​	$	2,378	​	$	887	​	$	3,265

​

​	​	​	​	​	​	​	​	​	​
​	​	Three Months Ended March 31, 2023
​		Product Revenues			Service Revenues			Total
Timing of revenue recognition		​			​			​
At a point in time	​	$	599	​	$	—	​	$	599
Over time	​		—	​		2,463	​		2,463
Total	​	$	599	​	$	2,463	​	$	3,062

​

Net revenues categorized by customer location are as follows (in thousands):

​	​	​	​	​	​	​
​	​	Three Months Ended March 31,
​		​	2024		​	2023
Korea	​	$	2,000	​	$	—
Germany	​		796	​		—
United States	​		389	​		1,968
China	​		80	​		1,094
Total	​	$	3,265	​	$	3,062

​

​	​	​	​	​	​	​	​	​	​
​	​	For the year ended December 31, 2023
(in thousands)	​	Product Revenues		​	Service Revenues		​	Total
Timing of revenue recognition		​			​			​
At a point in time	​	$	10,968	​	$	—	​	$	10,968
Over time	​		—	​		5,060	​		5,060
Total	​	$	10,968	​	$	5,060	​	$	16,028

​

​

​	​	​	​	​	​	​	​	​	​
​	​	For the year ended December 31, 2022
(in thousands)		Product Revenues			Service Revenues			Total
Timing of revenue recognition		​			​			​
At a point in time	​	$	12,977	​	$	—	​	$	12,977
Over time	​		—	​		3,692	​		3,692
Total	​	$	12,977	​	$	3,692	​	$	16,669

Net revenues categorized by customer location are as follows for the years ended December 31:

​	​	​	​	​	​	​
​	​	Revenues from external customers
(in thousands)	​	2023		​	2022
United States		$	5,056		$	4,379
China	​		4,745	​		5,608
Korea	​		4,260	​		1,360
Germany	​		1,422	​		—
Taiwan	​		543	​		4,639
Other	​		2	​		25
Singapore	​		—	​		658
Total	​	$	16,028	​	$	16,669

Schedule of contract assets and liabilities and net revenues recognized in relation to contract liabilities

Details of contract assets and liabilities is as follows (in thousands):

​	​	​	​	​	​	​
​		March 31, 2024			December 31, 2023
Contract assets	​	$	4,313	​	$	3,439
Assets recognized for costs incurred to fulfill a contract (*)	​		13	​		12
Contract liabilities	​		35	​		48

(*) The balances are included in prepaid expenses and other current assets in the accompanying condensed consolidated balance sheets.

​

​	​	​	​	​	​	​
(in thousands)	​	December 31, 2023		​	December 31, 2022
Contract assets	​	$	3,439	​	$	886
Assets recognized for costs incurred to fulfill a contract (*)	​		12	​		39
Contract liabilities	​		48	​		651

(*)- The balances are included in prepaid expenses and other current assets in the accompanying consolidated balance sheets.

Schedule of net revenues and gross accounts receivable concentration

Net revenues recognized in relation to contract liabilities are as follows as of the periods indicated (in thousands):

​	​	​	​	​	​	​
​		March 31, 2024			March 31, 2023
Net revenues recognized that were included in the contract liabilities balance at the beginning of the period	​	$	12	​	$	650

​

​

​	​	​	​	​	​	​
(in thousands)		December 31, 2023			December 31, 2022
Net revenues recognized that were included in the contract liabilities balance at the beginning of the year	​	$	651	​	$	766

Details of external customers, who contribute more than 10% of the Company’s net revenues and gross accounts receivable as of December 31, 2023 and 2022, are as follows:

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Net Revenues

​

Accounts Receivable

(in thousands)

​

2023

​

2022

​

2023

​

2022

Customer A

$

*

$

4,639

$

*

$

1,228

Customer B

​

3,031

​

2,979

​

1,755

​

590

Customer C

​

*

​

1,712

​

*

​

1,400

Customer D

​

*

​

1,670

​

661

​

687

Customer E

​

*

​

*

​

*

​

610

Customer F

​

*

​

*

​

1,250

​

*

Customer G

​

3,000

​

*

​

*

​

*

Customer H

​

*

​

*

​

938

​

*

*Less than 10%

Schedule of changes in provisions for product warranties

Details and changes in provisions for product warranties for the years ended December 31, 2023 and 2022, are as follows:

​	​	​	​	​	​	​
(in thousands)		2023			2022
Beginning balance	​	$	64	​	$	106
Provision	​		18	​		—
Adjustment to prior provisions	​		(27)	​		(42)
Ending balance	​	$	55	​	$	64

Schedule of foreign currency exchange gains and losses

​	​	​	​	​	​	​
(in thousands)		2023			2022
Foreign currency gain, net	​	$	265	​	$	181

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Tabular disclosure of receivable, contract asset, and contract liability from contract with customer. Includes, but is not limited to, change in contract asset and contract liability.

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