STOCKHOLDERS’ EQUITY (Stock Option Activity) (Details) - Stock Options - $ / shares	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Options
Beginning balance	8,697,613	10,873,292
Granted	776,746	870,000
Exercised	(2,261,122)	(2,594,050)
Forfeited	(437,881)	(451,629)
Ending balance	6,775,356	8,697,613	10,873,292
Exercisable	5,368,458
Vested	5,460,777
Weighted Average Exercise Price
Beginning balance	$ 2.08	$ 1.50
Granted	9.44	10.86
Exercised	1.02	0.78
Forfeited	7.94	3.03
Ending balance	2.90	2.08	$ 1.50
Exercisable	1.37
Vested	1.48
Intrinsic Value
Beginning balance	5.00	5.08
Granted	0.64	3.78
Exercised	8.56	11.90
Forfeited	2.45	9.59
Ending balance	8.43	$ 5.00	$ 5.08
Exercisable	9.96
Vested	$ 9.85
Weighted Average Remaining Contractual Term
Weighted average remaining contractual term, beginning	5 years 7 months 2 days	6 years 26 days	6 years 7 months 24 days
Weighted average remaining contractual term, granted	9 years 6 months 7 days	9 years 4 months 2 days
Weighted average remaining contractual term, exercisable	4 years 8 months 16 days
Weighted average remaining contractual term, vested	4 years 9 months 11 days

Intrinsic value.

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The grant-date intrinsic value of options exercisable during the reporting period as calculated by applying the disclosed option pricing methodology.

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The grant-date intrinsic value of options exercised during the reporting period as calculated by applying the disclosed option pricing methodology.

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Intrinsic value balance

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The grant-date intrinsic value of options vested during the reporting period as calculated by applying the disclosed option pricing methodology.

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Weighted average remaining contractual term options granted

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Weighted average remaining contractual term

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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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For presentations that combine terminations, 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 or that expired.

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The combined weighted average of the accumulated differences between the fair values on underlying shares and exercises prices to acquire such shares as of the grant date on options that were either forfeited or lapsed.

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

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The grant-date intrinsic value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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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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Number of fully vested and expected to vest exercisable options that may 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 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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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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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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Weighted average remaining contractual term for fully vested and expected to vest exercisable or convertible options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. 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 remaining contractual term of exercisable stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of share options (or share units) exercised during the current period.

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