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Restructuring and Severance (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Restructuring And Related Activities [Abstract]    
Balance at beginning of period   $ 129
Restructuring expense (income) for the period $ 65 (12)
Net payments during the period $ (65) 12
Balance at end of period   $ 129