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Stockholders' Equity - Additional Information (Detail) - USD ($)
1 Months Ended 6 Months Ended
May 31, 2017
Mar. 31, 2017
Jun. 30, 2017
Class of Stock [Line Items]      
Proceeds from exercise of warrants     $ 3,119,000
OrbiMed Israel Partners Limited Partnership [Member] | Ordinary Shares [Member]      
Class of Stock [Line Items]      
Number of warrants exercised to purchase shares 10,737    
Peregrine Management II Ltd. [Member] | Ordinary Shares [Member]      
Class of Stock [Line Items]      
Number of warrants exercised to purchase shares 2,148    
Pontifax [Member] | Ordinary Shares [Member]      
Class of Stock [Line Items]      
Number of warrants exercised to purchase shares 18,940    
Preferred Class B [Member] | OrbiMed Israel Partners Limited Partnership [Member]      
Class of Stock [Line Items]      
Number of warrants exercised to purchase shares 149,686 22,679  
Warrant exercise price   $ 17.64  
Proceeds from exercise of warrants $ 2,600,000 $ 400,000  
Preferred Class B [Member] | OrbiMed Israel Partners Limited Partnership [Member] | Weighted Average [Member]      
Class of Stock [Line Items]      
Warrant exercise price $ 16.46    
Preferred Class B [Member] | Peregrine Management II Ltd. [Member]      
Class of Stock [Line Items]      
Number of warrants exercised to purchase shares 4,460    
Proceeds from exercise of warrants $ 79,000    
Preferred Class B [Member] | Peregrine Management II Ltd. [Member] | Weighted Average [Member]      
Class of Stock [Line Items]      
Warrant exercise price $ 11.91