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Basis of Presentation of Interim Period Statements - Summary of Basic and Diluted Common Shares Outstanding (Detail) - shares
shares in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Weighted Average Number Of Shares Outstanding Diluted Disclosure Items [Abstract]    
Weighted average number of basic shares outstanding 7,407 7,304
Weighted average number of diluted shares outstanding 7,407 7,304