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Basis of Presentation and Significant Accounting Policies - Inventories (Detail) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Inventory Disclosure [Abstract]    
Raw material $ 325 $ 325
Work in process 8,383 8,390
Finished goods 8,601 7,285
Inventory, Total $ 17,309 $ 16,000