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SHAREHOLDERS' EQUITY (Schedule of Stock Option Activity) (Details) - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Number of shares upon exercise
Outstanding at beginning of year	1,453,741	1,736,143	2,189,297
Granted			62,200
Forfeited	(28,657)	(59,107)	(414,617)
Exercised	(290,828)	(223,295)	(100,737)
Outstanding at end of year	1,134,256	1,453,741	1,736,143
Exercisable at end of year	1,065,498	1,240,005	1,281,665
Vested and expected to vest	1,132,007	1,442,990	1,464,802
Weighted average exercise price
Outstanding at beginning of year	$ 7.59	$ 7.26	$ 7.63
Granted			5.91
Forfeited	17.47	10.05	9.79
Exercised	6.25	4.36	4.07
Outstanding at end of year	7.68	7.59	7.26
Exercisable at end of year	7.83	8.01	8.02
Vested and expected to vest	$ 7.68	$ 7.61	$ 7.65

X

- Definition

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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

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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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Weighted-average exercise price, at which grantee can acquire shares reserved for issuance, for fully vested and expected to vest exercisable or convertible options. 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 price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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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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