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Stockholder's Equity - Common Stock Narrative (Detail) - USD ($)
12 Months Ended
Nov. 09, 2018
Dec. 31, 2020
Nov. 04, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Common Stock, shares authorized (in shares)   235,000,000   175,000,000 125,000,000 75,000,000
Treasury stock acquired (in shares)   47,503        
Treasury stock acquired, price (in dollars per share)   $ 4.28        
Treasury stock value repurchased   $ 200,000        
Common Stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Company's securities for shelf registration $ 125,000,000          
Authorized amount of stock to repurchase     $ 25,000,000