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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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The percentage of annual increase of total number of shares issued and outstanding.

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Number of quarters in which the grants vest after the initial vesting in share based arrangement.

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Percentage of share-based compensation awards that vest quarterly over the next twelve quarters after the initial vesting.

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Face amount or stated value per share of common stock.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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Gross number of share options (or share units) granted during the period.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Percentage of vesting of share-based compensation awards.

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