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Share Capital - Additional Information (Details)
$ / shares in Units, $ in Thousands
 1 Months Ended 12 Months Ended
Apr. 19, 2017
shares
Jan. 31, 2018
USD ($)
$ / shares
shares
May 31, 2017
USD ($)
$ / shares
shares
Apr. 30, 2017
USD ($)
shares
Mar. 31, 2017
shares
Oct. 31, 2015
USD ($)
$ / shares
shares
Dec. 31, 2017
USD ($)
$ / shares
shares
Dec. 31, 2016
USD ($)
$ / shares
shares
Dec. 31, 2015
USD ($)
$ / shares
shares
Class Of Stock [Line Items]                  
Share split, conversion ratio 3.2                
Issuance of ordinary shares for each outstanding ordinary, Preferred A and Preferred A-1 shares held immediately prior to share split 2.2                
Stock split description             On April 19, 2017, the Company’s board of directors and shareholders approved an aggregate 3.2 for-1 share split of the Company’s ordinary, Preferred A and Preferred A-1 shares. The share split was effected on April 19, 2017 by the issuance of 2.2 ordinary shares for each outstanding ordinary, Preferred A and Preferred A-1 share held immediately prior to the share split.    
Issuance of ordinary shares, consideration received net of underwriting discounts and commissions and issuance costs | $                 $ 21,255
Dividends at the rate per annum             8.00%    
Percentage of outstanding preferred stock shares             60.00%    
Exercise of options into ordinary shares, amount received | $             $ 404    
Number of shares surrendered to pay the exercise price             68,416    
Share-based compensation | $             $ 6,300 $ 1,967 449
Fair value of option granted | $             14,249 $ 906 $ 2,334
Number of ordinary shares issuable upon vesting of options granted               38,400  
Aggregate intrinsic value of the total vested and exercisable options | $             $ 38,308    
Employees and Directors                  
Class Of Stock [Line Items]                  
Exercise of options into ordinary shares, shares             682,184    
Stock options granted             712,900 404,813 1,098,777
Stock option exercise prices ranging lower limit | $ / shares             $ 0 $ 5 $ 0
Stock option exercise prices ranging upper limit | $ / shares             $ 39.26 $ 5.94 $ 5.94
Unrecognized compensation cost of employee options | $             $ 14,131    
Expected to be recognized over a weighted average period             3 years 3 months 21 days    
Consultants and Service Providers                  
Class Of Stock [Line Items]                  
Stock options granted             0 132,032 203,820
Stock option exercise prices ranging lower limit | $ / shares               $ 0 $ 0
Stock option exercise prices ranging upper limit | $ / shares               $ 5.94 $ 5.94
Fair value of option granted | $               $ 671 $ 57
2017 Equity Incentive Plan                  
Class Of Stock [Line Items]                  
Maximum number of ordinary share isuable under the 2017 incentive plan         1,400,000   5,600,000    
Number of ordinary shares reserved for issuance, percentage             12.00%    
Restricted Stock Units (RSUs)                  
Class Of Stock [Line Items]                  
Modifications of performance conditions in shares       67,200          
Ordinary Shares                  
Class Of Stock [Line Items]                  
Exercise of options into ordinary shares, shares             812,222 4,784  
Number of shares issued upon exercise of options, net of shares surrendered             743,806    
Number of shares surrendered to pay the exercise price             68,416    
Minimum [Member]                  
Class Of Stock [Line Items]                  
Pre-money valuation to convert automatically each preferred shares into ordinary shares upon the closing of an IPO | $             $ 75,000    
Net proceeds required to automatically convert preferred shares to ordinary shares upon the closing of an IPO | $             $ 25,000    
Minimum [Member] | 2017 Equity Incentive Plan                  
Class Of Stock [Line Items]                  
Exercise price of stock option as percentage of fair market value on the date of grant             100.00%    
General and Administrative Expenses                  
Class Of Stock [Line Items]                  
IPO costs | $             $ 0 $ 1,700  
Share-based compensation | $             2,377 $ 800 $ 279
General and Administrative Expenses | Restricted Stock Units (RSUs)                  
Class Of Stock [Line Items]                  
Share-based compensation | $       $ 527          
IPO                  
Class Of Stock [Line Items]                  
Issuance of ordinary shares, consideration received net of underwriting discounts and commissions and issuance costs | $             $ 60,772    
Preferred A and Preferred A-1 shares into ordinary shares conversion ratio     100.00%            
IPO | Ordinary Shares                  
Class Of Stock [Line Items]                  
Issuance of ordinary shares, shares             5,144,378    
Issuance of ordinary shares, consideration received net of underwriting discounts and commissions and issuance costs | $             $ 15    
IPO | Nasdaq                  
Class Of Stock [Line Items]                  
Issuance of ordinary shares, shares     5,144,378            
Issuance of ordinary shares, price per share | $ / shares     $ 13.00            
Issuance of ordinary shares, consideration received net of underwriting discounts and commissions and issuance costs | $     $ 60,800            
Additional ordinary shares exercised under underwriters option to purchase at the public offering price     671,005            
Secondary Public Offering | Nasdaq | Subsequent Event                  
Class Of Stock [Line Items]                  
Issuance of ordinary shares, shares   1,682,926              
Issuance of ordinary shares, price per share | $ / shares   $ 41.00              
Issuance of ordinary shares, consideration received net of underwriting discounts and commissions and issuance costs | $   $ 64,000              
Additional ordinary shares exercised under underwriters option to purchase at the public offering price   219,512              
Preferred A Shares                  
Class Of Stock [Line Items]                  
Preferred stock price per share | $ / shares             $ 5.94    
Series A-1 Preferred Shares                  
Class Of Stock [Line Items]                  
Preferred stock price per share | $ / shares             $ 7.81    
Series A-1 Preferred Shares | IPO                  
Class Of Stock [Line Items]                  
Stock issued during period upon conversion of warrants, shares     364,036            
TMX | Intellectual Property Costs                  
Class Of Stock [Line Items]                  
Research and development expenses incurred | $           $ 4,100      
TMX | Preferred A Shares                  
Class Of Stock [Line Items]                  
Purchase of IP R&D in consideration, shares           691,200      
Preferred stock price per share | $ / shares           $ 5.94