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Inventory (Detail) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Current assets    
Finished goods $ 1,320 $ 1,140
Total inventory, current 1,320 1,140
Non-Current assets    
Raw materials 659 659
Work-in-process 949 1,109
Finished goods 934 1,056
Total inventory, non-current 2,542 2,824
Total inventory $ 3,862 $ 3,964