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SUPPLEMENTAL BALANCE SHEET DISCLOSURES - Inventory (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2023
Dec. 31, 2022
Inventory    
Raw materials $ 331 $ 344
Work-in-process 199 284
Finished goods 105 39
Inventory 635 667
Inventory reserve (72) (78)
Total inventory, net of reserve 563 $ 589
Work-in-process inventory written off to inventory reserve $ 14