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Financings - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
6 Months Ended
Mar. 10, 2020
Feb. 05, 2020
Jun. 30, 2019
Jun. 30, 2020
Class of Stock [Line Items]        
Sale of stock consideration received on transaction       $ 88,661
At The Market Offering [Member]        
Class of Stock [Line Items]        
Stock issued during period       2,814,673
Sale of stock consideration received on transaction       $ 13,000
Underwriting offering cost       $ 400
Underwriting Agreement [Member]        
Class of Stock [Line Items]        
Stock issued during period   27,826,086    
Issuance & sale of common stock in public offering price per share   $ 3.25    
Sale of stock consideration received on transaction   $ 84,800    
par value per share   $ 3.055    
Underwriting Agreement [Member] | Maximum        
Class of Stock [Line Items]        
Stock issued during period   4,173,912    
par value per share   $ 3.055    
Underwriting Agreement [Member] | Stock Option [Member]        
Class of Stock [Line Items]        
Stock issued during period 1,284,025      
Sale of stock consideration received on transaction $ 3,900      
Open Market Sale Agreement [Member] | At The Market Offering [Member]        
Class of Stock [Line Items]        
Sale of stock consideration received on transaction     $ 100,000