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Stockholders' Equity - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Stockholders Equity Disclosure [Line Items]    
Net proceeds from sale of common stock after deducting underwriting commissions and offering expenses $ 49.3  
Underwriting discounts, commissions and offering expenses payable $ 3.6  
Common Stock    
Stockholders Equity Disclosure [Line Items]    
Issuance of common stock for public offering, net of issuance costs of $2,514 and $3,536, shares 9,185,000 5,307,692
Common stock price, per share $ 5.75  
Common Stock | Underwriters' Overallotment Option    
Stockholders Equity Disclosure [Line Items]    
Issuance of common stock for public offering, net of issuance costs of $2,514 and $3,536, shares 485,000