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Components of Inventory (Detail) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Components of inventory, net of allowances    
Raw materials $ 4,465 $ 3,689
Work-in-process 1,475 1,064
Finished goods 6,252 6,242
Inventory $ 12,192 $ 10,995