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Balance Sheet Components (Tables)

3 Months Ended

12 Months Ended

Mar. 31, 2024

Dec. 31, 2023

Balance Sheet Components

Schedule of Inventory

​

​	​	​	​	​	​	​
​		March 31,			December 31,
​	​	2024		​	2023
Raw materials	​	$	414	​	$	448
Work-in-process		​	498		​	601
Finished goods		​	872		​	437
Total inventory	​	$	1,784	​	$	1,486

​

​	​	​	​	​	​	​
(in thousands)		2023			2022
Raw materials	​	$	448	​	$	182
Work-in-process	​		601	​		891
Finished goods	​		437	​		2,407
​	​	$	1,486	​	$	3,480

Schedule of Prepaid expenses and other assets

​

​	​	​	​	​	​	​
​		March 31,			December 31,
​	​	2024		​	2023
Prepaid expenses	​	$	3,345	​	$	433
Prepaid inventory	​	​	1,429	​	​	279
Lease deposit		​	413		​	434
Other receivables and current assets		​	279		​	117
IPO expenses		​	—		​	1,643
Prepaid expenses and other current assets	​	$	5,466	​	$	2,906

​

​	​	​	​	​	​	​
(in thousands)		2023			2022
IPO expenses	​	$	1,643	​	$	—
Intellectual property rights	​		761	​		861
Lease deposit	​		554	​		555
Prepaid expenses	​		433	​		799
Prepaid inventory	​		279	​		1,310
Other receivables	​		105	​		102
Costs incurred to fulfill a contract	​		12	​		39
​	​		3,787	​		3,666
Less: Non-current assets	​		(881)	​		(993)
Prepaid expenses and other current assets	​	$	2,906	​	$	2,673

Schedule of Accrued and other current liabilities

​

​	​	​	​	​	​	​
​		March 31,			December 31,
​	​	2024		​	2023
Payroll and related expenses	​	$	9,830	​	$	9,880
Accrued payables	​	​	7,853	​	​	6,319
Other taxes payable	​	​	3,399	​	​	158
Current portion of interest payable	​	​	3,395	​	​	6,915
Professional fees		​	444		​	499
Royalty and license fee		​	60		​	58
Product warranty		​	64		​	55
Other		​	107		​	72
Accrued and other current liabilities	​	$	25,152	​	$	23,956

​

​

​	​	​	​	​	​	​
(in thousands)		2023			2022
Payroll and related expenses	​	$	10,038	​	$	6,635
Accrued payables	​		6,319	​		2,233
Royalty and license fee	​		58	​		37
Professional fees	​		499	​		479
Current portion of interest payable	​		6,915	​		2,944
Product warranty	​		55	​		64
Other	​		72	​		104
​	​	$	23,956	​	$	12,496

Schedule of Property and equipment, net

​

​	​	​	​	​	​	​
(in thousands)		2023			2022
Production equipment	​	$	14,887	​	$	14,800
IT equipment	​		1,127	​		1,212
Furniture and fixtures	​		784	​		799
Leasehold improvements	​		293	​		388
Fixed assets in process	​		—	​		39
Total property and equipment	​		17,091	​		17,238
Less: accumulated depreciation and amortization	​		(16,319)	​		(16,127)
​	​	$	772	​	$	1,111

Schedule of components of lease expense and other information related to leases

​

​	​	​	​	​	​	​
(in thousands)		2023			2022
Operating lease expense	​	$	772	​	$	733
Finance lease expense	​			​
Amortization of right of use assets	​		14	​		18
Interest on lease liabilities	​		1	​		2
Total finance lease expense	​		15	​		20
​	​	$	787	​	$	753

​

​	​	​	​	​	​	​	​
(in thousands)		2023			2022
Supplemental cash flow information:	​	​	​	​	​	​	​
Cash paid for amounts included in the measurement of lease liabilities		​			​		​
Cash used in operations for operating leases	​	$	766	​	$	770	​
Cash used in operations for finance leases	​		1	​		2	​
Payments made on finance leases	​		17	​		24	​
ROU assets obtained in exchange for lease obligations:	​			​			​
Operating leases	​		1,476	​		826	​
Weighted average remaining lease term:	​			​			​
Operating leases	​		2.25 years	​		3.57 years	​
Finance leases	​		—	​		0.90 years	​
Weighted average discount rate:	​			​			​
Operating leases	​		4.66	%		4.00	%
Finance leases	​		—	​		9.70	%

Schedule of Maturities of lease liabilities under noncancellable leases

​

​	​	​	​
​		Operating
(in thousands)	​	leases
2024	​	$	743
2025	​		712
2026	​		169
Total undiscounted lease payments	​		1,624
Less: imputed interest	​		(94)
Total lease liabilities	​	$	1,530

Schedule of Intangibles, net

​

​	​	​	​	​	​	​
(in thousands)		2023			2022
Intellectual properties	​	$	1,118	​	$	943
Intangible assets in process	​		—	​		180
Total acquired intangibles	​		1,118	​		1,123
Less: accumulated amortization	​		(873)	​		(451)
​	​	$	245	​	$	672

Schedule of Other liabilities

​

​	​	​	​	​	​	​
(in thousands)		2023			2022
Severance payments liability	​	$	92		$	76
Interest payable	​		16			—
​	​	$	108		$	76

​

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