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Share-Based Compensation - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  | 3 Months Ended | 6 Months Ended |  |  |  |  |  |
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Feb. 14, 2020 | Dec. 05, 2018 | Oct. 14, 2016 | Oct. 14, 2015 | Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Jun. 10, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Mar. 14, 2018 | May 18, 2017 | Nov. 18, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ordinary shares, shares issued |  |  |  |  | 17,852,149 |  | 17,852,149 |  |  | 14,868,973 |  |  |  |
Share options granted |  |  |  |  |  |  | 64,840 |  |  |  |  |  |  |
Restricted Ordinary Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued in the period |  |  |  | 413,110 |  |  | 0 |  |  |  |  |  |  |
Percentage of remaining restricted ordinary shares vest on monthly basis |  |  | 0.0278% |  |  |  |  |  |  |  |  |  |  |
Grant date fair value |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3.14
Expense recognized |  |  |  |  |  |  |  | $ 167 |  |  |  |  |  |
Unamortized stock compensation expense |  |  |  |  |  | $ 93 |  | $ 93 |  |  |  |  |  |
Stock-based compensation expense, expected weighted average period for recognition |  |  |  |  |  |  |  | 3 months 14 days |  |  |  |  |  |
Restricted Ordinary Shares | Tranche One |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of awards vested |  |  | 25.00% |  |  |  |  |  |  |  |  |  |  |
Employee Stock Options |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expense recognized |  |  |  |  |  |  | $ 663 | $ 655 |  |  |  |  |  |
Unvested employee options outstanding |  |  |  |  | 550,521 | 925,549 | 550,521 | 925,549 |  |  |  |  |  |
Unamortized compensation expense share options |  |  |  |  | $ 2,336 | $ 4,107 | $ 2,336 | $ 4,107 |  |  |  |  |  |
Vesting period |  |  |  |  |  |  | 2 years 1 month 2 days | 3 years 25 days |  |  |  |  |  |
Restricted Share Units (RSUs) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Grant date fair value |  |  |  |  | $ 7.01 |  | $ 7.01 |  |  | $ 7.01 |  |  |  |
Expense recognized |  |  |  |  |  |  | $ 62 | $ 201 |  |  |  |  |  |
Unamortized stock compensation expense |  |  |  |  |  | 210 |  | $ 210 |  |  |  |  |  |
Stock-based compensation expense, expected weighted average period for recognition |  |  |  |  |  |  |  | 11 months 15 days |  |  |  |  |  |
Restricted Share Units (RSUs) | Director |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  |  |  | 1 year |  |  |  |  |  |  |
Number of shares, granted/awarded |  |  |  |  |  |  | 0 | 31,367 |  |  |  |  |  |
Performance RSUs |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Grant date fair value |  |  |  |  | $ 2.30 |  | $ 2.30 |  |  | $ 8.21 |  |  |  |
Expense recognized |  |  |  |  |  |  | $ 1,058 | $ 90 |  |  |  |  |  |
Unamortized stock compensation expense |  |  |  |  | $ 1,247 | $ 320 | $ 1,247 | $ 320 |  |  |  |  |  |
Stock-based compensation expense, expected weighted average period for recognition |  |  |  |  |  |  | 5 months 12 days | 1 year 3 months 25 days |  |  |  |  |  |
Number of shares, granted/awarded |  |  |  |  | 0 | 0 | 1,079,000 | 50,000 |  |  |  |  |  |
Restricted Ordinary Shares, Options and Restricted Share Units and Performance RSUs |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  |  |  | 11 months 26 days | 2 years 9 months 29 days |  |  |  |  |  |
Unamortized compensation expense |  |  |  |  | $ 3,583 | $ 4,730 | $ 3,583 | $ 4,730 |  |  |  |  |  |
2015 Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares authorized |  |  |  |  |  |  |  |  |  |  |  |  |  | 223,424
Number of ordinary shares available for issuance |  |  |  |  |  |  |  |  |  |  |  |  | 443,029 | 219,605
2018 Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares authorized |  |  |  |  |  |  |  |  |  |  |  | 1,018,459 |  |
Increase in number of ordinary shares available to be granted, percentage | 4.00% | 4.00% |  |  |  |  |  |  |  |  |  |  |  |
Ordinary shares, shares issued | 594,758 |  |  |  |  |  |  |  | 2,250,000 |  | 574,081 |  |  |
2018 Plan | Employees and Directors |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share options granted |  |  |  |  |  |  | 64,840 | 512,178 |  |  |  |  |  |

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