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Intangibles - Components of Intangible Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Finite Lived Intangible Assets [Line Items]    
Intangible assets, Net Carrying Value $ 2,310 $ 2,532
License Agreements [Member]    
Finite Lived Intangible Assets [Line Items]    
Intangible assets, Gross Carrying Value 3,117 3,117
Intangible assets, Accumulated Amortization (807) (585)
Intangible assets, Net Carrying Value $ 2,310 $ 2,532