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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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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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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

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SHARE-BASED COMPENSATION (Equity Incentive Plans and Stock Option Activity) (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	12 Months Ended
	May 31, 2007	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Apr. 30, 2013	Apr. 30, 2011	Mar. 31, 2011	Sep. 30, 2004
SHARE-BASED COMPENSATION
Grants in period		0	0
Stock Option
SHARE-BASED COMPENSATION
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Outstanding			$ 800	$ 200
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term		4 years 2 months 12 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value		$ 2,410
Contractual terms		10 years
Grants in period		0	0	0
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price		$ 0.00
Shares
Outstanding at the beginning of the period (in shares)		162,063
Changes during the period
Exercised (shares)		0
Expired (in shares)		(1,175)
Forfeited (in shares)		(629)
Outstanding at the end of the period (in shares)		160,259	162,063
Weighted Average Exercise Price
Outstanding at the beginning of the period (in dollars per share)		$ 24.95
Changes during the period:
Exercised (in dollars per share)		0.00
Expired (in dollars per share)		706.54
Forfeited (in dollars per share)		210.50
Outstanding at the end of the period (in dollars per share)		$ 19.22	$ 24.95
Weighted Average Remaining Contractual Term
Outstanding		4 years 2 months 12 days
Aggregate Intrinsic Value
Outstanding		$ 2,410
Additional disclosures
Total fair value of shares vested		$ 500	$ 400	$ 400
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number		160,259
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price		$ 19.22
Stock Option \| Stock Compensation 2004 Plan
SHARE-BASED COMPENSATION
Shares authorized for grants						4,944,831	1,402,589	1,500,000
Additional shares authorized for grants	1,000,000	1,567,912	1,671,752	1,922,130
Stock Option \| Stock Option 2013 Plan
SHARE-BASED COMPENSATION
Shares authorized for grants					2,200,000
Stock Option \| Minimum
SHARE-BASED COMPENSATION
Vesting period		3 years
Stock Option \| Maximum
SHARE-BASED COMPENSATION
Vesting period		5 years