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Summary Of Significant Accounting Policies - Summary Of Right Of Use Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Lessee, Lease, Description [Line Items]      
Right Of Use Assets Total $ 97 $ 4,537 $ 176
Land [Member]      
Lessee, Lease, Description [Line Items]      
Right Of Use Assets Total   140  
Building [Member]      
Lessee, Lease, Description [Line Items]      
Right Of Use Assets Total   4,017  
Equipment [Member]      
Lessee, Lease, Description [Line Items]      
Right Of Use Assets Total   $ 380 $ 176