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Share Capital - Additional Information (Details) $ / shares in Units, $ in Thousands |  | 1 Months Ended | 12 Months Ended
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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 |  |  |

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