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Summary of Significant Accounting Policies - Schedule of Inventory (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Accounting Policies [Abstract]    
Raw materials $ 171 $ 160
Work-in-process 560 440
Finished goods 62 44
Inventory 793 644
Inventory reserve (255) (255)
Total inventory, net of reserve $ 538 $ 389