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Inventory (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Current assets    
Work-in-process $ 66 $ 0
Finished goods 1,214 1,140
Total inventory, current 1,280 1,140
Non-Current assets    
Raw materials 744 659
Work-in-process 4,045 1,109
Finished goods 302 1,056
Total inventory, non-current 5,091 2,824
Total inventory $ 6,371 $ 3,964