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Shareholders' Equity - Additional Information (Detail) - Common Stock [Member] - USD ($)
$ / shares in Units, shares in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
May 31, 2019
Issuance of common stock 336 28 336  
Common stock price per share   $ 21.92    
Cash proceeds from sale of common stock   $ 611,000    
Sale of common stock, sales agent commissions   14,000    
Stock issuance cost   23,000    
Net cash proceeds from sale of common stock   $ 574,000    
Maximum [Member]        
Aggregate offering price of common stock       $ 30,000,000