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SHARE INCENTIVE PLAN (Details) |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Apr. 02, 2018 $ / shares shares | Jul. 01, 2017 $ / shares shares | Jun. 22, 2017 item $ / shares shares | Dec. 31, 2018 $ / shares shares | Dec. 31, 2017 $ / shares shares | Dec. 31, 2016 $ / shares
SHARE INCENTIVE PLAN |  |  |  |  |  |
Ordinary shares, par value (in dollars per share) | $ / shares |  |  |  | $ 0.001 | $ 0.001 | $ 0.001
Share options granted (in shares) | shares |  |  |  | 20,000 | 2,109,305 |
Exercise price per share of the options granted | $ / shares |  |  |  | $ 0.01 | $ 11.42 |
Directors |  |  |  |  |  |
SHARE INCENTIVE PLAN |  |  |  |  |  |
Share options granted (in shares) | shares |  |  | 1,286,878 |  |  |
Exercise price per share of the options granted | $ / shares |  |  | $ 11.66 |  |  |
Employees |  |  |  |  |  |
SHARE INCENTIVE PLAN |  |  |  |  |  |
Share options granted (in shares) | shares | 20,000 |  |  |  |  |
Exercise price per share of the options granted | $ / shares | $ 0.01 |  |  |  |  |
Vesting of share-based compensation (as a percent) | 25.00% |  |  |  |  |
Shares vesting quarterly in twelve quarters (as a percent) | 75.00% |  |  |  |  |
Number of quarters of vesting | 12 |  |  |  |  |
Director and consultant |  |  |  |  |  |
SHARE INCENTIVE PLAN |  |  |  |  |  |
Share options granted (in shares) | shares |  | 50,300 |  |  |  |
Exercise price per share of the options granted | $ / shares |  | $ 1.48 |  |  |  |
Completion of IPO before June 22, 2018 | Directors |  |  |  |  |  |
SHARE INCENTIVE PLAN |  |  |  |  |  |
Vesting of share-based compensation (as a percent) |  |  | 25.00% |  |  |
Shares vesting quarterly in twelve quarters (as a percent) |  |  | 75.00% |  |  |
Number of quarters of vesting | item |  |  | 12 |  |  |
Non completion of IPO before June 22, 2018 | Directors |  |  |  |  |  |
SHARE INCENTIVE PLAN |  |  |  |  |  |
Vesting of share-based compensation (as a percent) |  |  | 25.00% |  |  |
Shares vesting quarterly in twelve quarters (as a percent) |  |  | 75.00% |  |  |
Number of quarters of vesting | item |  |  | 12 |  |  |
Completion of IPO on September 27, 2018 | Employees |  |  |  |  |  |
SHARE INCENTIVE PLAN |  |  |  |  |  |
Share options granted (in shares) | shares |  |  | 772,127 |  |  |
Exercise price per share of the options granted | $ / shares |  |  | $ 11.66 |  |  |
Vesting of share-based compensation (as a percent) |  |  | 25.00% |  |  |
Shares vesting quarterly in twelve quarters (as a percent) |  |  | 75.00% |  |  |
Number of quarters of vesting | item |  |  | 12 |  |  |
2009 Share Incentive Plan |  |  |  |  |  |
SHARE INCENTIVE PLAN |  |  |  |  |  |
Total number shares authorized | shares |  |  |  | 2,573,756 |  |
Ordinary shares, par value (in dollars per share) | $ / shares |  |  |  | $ 0.001 |  |
2017 Share Incentive Plan |  |  |  |  |  |
SHARE INCENTIVE PLAN |  |  |  |  |  |
Total number shares authorized | shares |  |  |  | 2,059,005 |  |
Additional annual increase in number of shares (as a percent) |  |  |  | 2.00% |  |

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- Definition Percentage of share-based compensation awards that vest quarterly over the next twelve quarters after the initial vesting. + References No definition available. + Details
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