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Shareholders' Equity (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  | 3 Months Ended |
--- | --- | --- | --- | ---
Jan. 24, 2018 | Jan. 04, 2018 | Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Class of Stock [Line Items] |  |  |  |  |
Common stock, shares outstanding (in shares) |  | 26,281,396 | 39,403,898 |  | 6,795,627
Gross proceeds, offering amount |  |  | $ 78,518 | $ 0 |
Underwriting expenses |  |  | $ 5,300 |  |
Common Stock [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Conversion of convertible preferred shares into ordinary shares (in shares) |  | 19,475,788 | (19,475,788) |  |
Number of shares sold (in shares) |  |  | 6,325,000 |  |
Underwriting Agreement [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Number of shares sold (in shares) | 6,325,000 |  |  |  |
Options granted (in shares) | 825,000 |  |  |  |
Public offering price (in dollars per share) | $ 13.25 |  |  |  |
Gross proceeds, offering amount | $ 83,806 |  |  |  |
Underwriting expenses | 5,288 |  |  |  |
Net proceeds, offering amount | $ 78,518 |  |  |  |

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