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Convertible Loan - Additional Information (Detail) - Convertible Notes Payable [Member]
$ in Thousands
12 Months Ended
May 31, 2017
shares
Jan. 26, 2017
USD ($)
Lender
Dec. 31, 2018
Dec. 31, 2017
USD ($)
Debt Conversion [Line Items]        
Debt instrument, periodic payment, interest       $ 700
Series C Preferred Stock [Member]        
Debt Conversion [Line Items]        
Stock issued during period, shares, conversion of convertible securities | shares 825,213      
Financial and Other Expense [Member]        
Debt Conversion [Line Items]        
Other (income) expenses, net as a result of changes in the embedded instruments       $ 700
Fair Value, Inputs, Level 3 [Member]        
Debt Conversion [Line Items]        
Fair value assigned to the embedded conversion feature on the issuance dates   $ 308    
Convertible loan agreement [Member]        
Debt Conversion [Line Items]        
Debt instrument, convertible, latest date   2 years    
Debt instrument, convertible, terms of conversion feature     According to the Agreement, the outstanding portion of the Convertible Loan (without accrued interest) automatically converts upon the consummation of an equity investment by a third party of an aggregate amount of at least $5.0 million (the “Qualified Equity Investment”), prior to the date that is two years from the Closing Date (the “Maturity Date”), into equity securities of the same class issued by the Company in such Qualified Equity Investment.  
Convertible loan agreement [Member] | Lenders [Member]        
Debt Conversion [Line Items]        
Number of shareholder as lenders | Lender   5    
Debt instrument, interest rate, stated percentage   5.00%    
Debt instrument, face amount   $ 2,500    
Convertible loan agreement [Member] | Minimum [Member]        
Debt Conversion [Line Items]        
Qualified equity investment   $ 5,000