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Inventory - Summary of the Components of Inventories (Detail) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Inventory Disclosure [Abstract]    
Raw materials $ 592 $ 427
Work in process 507 481
Finished goods 983 991
Total current and non-current inventory, gross 2,082 1,899
Less: allowance for inventory excess and obsolescence (526) (611)
Total current and non-current inventory, net 1,556 1,288
Inventory, net 1,184 917
Non-current inventory, net $ 372 $ 371