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SHARE OPTIONS - Options Details and Assumptions Used to Estimate Fair Value of Options Granted (Details) $ / shares in Units, $ in Thousands		1 Months Ended	12 Months Ended
	Oct. 27, 2008 shares	May 31, 2014 shares	Dec. 31, 2019 USD ($) shares	Dec. 31, 2018 USD ($) $ / shares shares	Dec. 31, 2017 USD ($) $ / shares shares	Dec. 31, 2016 $ / shares shares	Dec. 31, 2015 $ / shares shares	Dec. 31, 2014 $ / shares shares	Dec. 31, 2013 $ / shares shares
Share options
Incremental compensation expenses | $			$ 2,060	$ 405	$ 1,865
2008 Plan
Share options
Shares authorized to grant | shares	4,444,444
Additional shares authorized to issue | shares		6,900,000
2008 Plan | Share options
Share options
Vesting period	4 years			4 years	4 years	4 years
Vesting percentage at the end of the first year through the fourth year	25.00%
Expiration period	10 years
Shares options granted | shares				44,000	120,000	4,000	546,400	1,797,300	307,250
Exercise price of shares options granted (in dollars per share)						$ 1.40	$ 2.25		$ 4.75
Incremental compensation expenses | $			66	$ 21	$ 97
Unrecognized incremental compensation cost | $			$ 9
Weighted-average period of recognition of unrecognized compensation cost			1 year 9 months 29 days
Assumptions used for estimating the fair value of options granted on the date of grant
Risk-free interest rate per annum (as a percent)					2.45%
Risk-free interest rate per annum, minimum (as a percent)				2.90%
Risk-free interest rate per annum, maximum (as a percent)				3.20%
Exercise multiple				2.2	2.2
Expected volatility (as a percent)					71.70%
Expected volatility, minimum (as a percent)				66.40%
Expected volatility, maximum (as a percent)				69.50%
Expected dividend yield (as a percent)				0.00%	0.00%
Fair value of ordinary shares (in dollars per share)					$ 0.70
Expected terms (in years)				10 years	10 years
2008 Plan | Share options | Minimum
Share options
Vesting period							3 months	3 years	3 years
Exercise price of shares options granted (in dollars per share)				$ 0.33	$ 0.89			$ 1.84
Assumptions used for estimating the fair value of options granted on the date of grant
Fair value of ordinary shares (in dollars per share)				0.44
2008 Plan | Share options | Maximum
Share options
Vesting period							4 years	4 years	4 years
Exercise price of shares options granted (in dollars per share)				1.92	$ 1.49			$ 3.26
Assumptions used for estimating the fair value of options granted on the date of grant
Fair value of ordinary shares (in dollars per share)				$ 1.04
2008 Plan | Nonvested shares
Share options
Vesting period				4 years	4 years
Nonvested shares granted | shares			1,829,000	244,000	272,000	296,000	3,154,800	2,800,300	711,571
Incremental compensation expenses | $			$ 1,995	$ 384	$ 1,768
Weighted-average period of recognition of unrecognized compensation cost			1 year 9 months 26 days
2008 Plan | Nonvested shares | Minimum
Share options
Vesting period						3 months	3 months	3 years	2 years
2008 Plan | Nonvested shares | Maximum
Share options
Vesting period						4 years	4 years	4 years	4 years

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The exercise multiple assumption that is used in valuing an option on its own shares.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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Number of additional shares authorized for issuance under share-based payment arrangement.

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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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