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Leases - Summary of Balance Sheet classification of lease asset and related lease liability (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Jan. 01, 2019
Assets:      
Long-term operating lease right-of-use assets $ 3,286 $ 4,617 $ 5,700
Liabilities:      
Short-term operating lease liability 1,079 1,396  
Long-term operating lease liability 2,325 3,321  
Total Liabilities $ 3,404 $ 4,717 $ 5,700