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SHAREHOLDERS' EQUITY - Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range (Details) € / shares in Units, € in Thousands | 12 Months Ended
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Dec. 31, 2020 EUR (€) € / shares shares
Outstanding options - Number (in shares) | shares | 1,186,900
Outstanding options - Weighted average remaining contractual life (Year) | 6 years
Outstanding options - Weighted average exercise price (in EUR per share) | € 2.81
Outstanding options - Aggregate intrinsic value | € | € 1,686,989
Exercisable options - Number (in shares) | shares | 970,650
Exercisable options - Weighted average exercise price (in EUR per share) | € 2.73
Exercisable options - Aggregate intrinsic value | € | € 1,458,076
Exercise price, Lower range (in EUR per share) | € 1.91
Exercise price, Upper range (in EUR per share) | € 3.90
Range 1 [Member] |
Outstanding options - Number (in shares) | shares | 130,000
Outstanding options - Weighted average remaining contractual life (Year) | 8 years 9 months 18 days
Outstanding options - Weighted average exercise price (in EUR per share) | € 3.90
Outstanding options - Aggregate intrinsic value | € | € 42,576
Exercisable options - Number (in shares) | shares | 32,500
Exercisable options - Weighted average exercise price (in EUR per share) | € 3.90
Exercisable options - Aggregate intrinsic value | € | € 13,017
Exercise price, Lower range (in EUR per share) | € 3.90
Range 2 [Member] |
Outstanding options - Number (in shares) | shares | 465,000
Outstanding options - Weighted average remaining contractual life (Year) | 5 years 3 months 18 days
Outstanding options - Weighted average exercise price (in EUR per share) | € 3.22
Outstanding options - Aggregate intrinsic value | € | € 468,492
Exercisable options - Number (in shares) | shares | 465,000
Exercisable options - Weighted average exercise price (in EUR per share) | € 3.22
Exercisable options - Aggregate intrinsic value | € | € 468,492
Exercise price, Lower range (in EUR per share) | € 3.22
Range 3 [Member] |
Outstanding options - Number (in shares) | shares | 145,000
Outstanding options - Weighted average remaining contractual life (Year) | 7 years 8 months 12 days
Outstanding options - Weighted average exercise price (in EUR per share) | € 2.65
Outstanding options - Aggregate intrinsic value | € | € 228,739
Exercisable options - Number (in shares) | shares | 72,500
Exercisable options - Weighted average exercise price (in EUR per share) | € 2.65
Exercisable options - Aggregate intrinsic value | € | € 114,369
Exercise price, Lower range (in EUR per share) | € 2.65
Range 4 [member] |
Outstanding options - Number (in shares) | shares | 184,400
Outstanding options - Weighted average remaining contractual life (Year) | 6 years 3 months 18 days
Outstanding options - Weighted average exercise price (in EUR per share) | € 2.39
Outstanding options - Aggregate intrinsic value | € | € 338,837
Exercisable options - Number (in shares) | shares | 138,150
Exercisable options - Weighted average exercise price (in EUR per share) | € 2.39
Exercisable options - Aggregate intrinsic value | € | € 253,852
Exercise price, Lower range (in EUR per share) | € 2.39
Range 5 [Member] |
Outstanding options - Number (in shares) | shares | 262,500
Outstanding options - Weighted average remaining contractual life (Year) | 2 years
Outstanding options - Weighted average exercise price (in EUR per share) | € 1.91
Outstanding options - Aggregate intrinsic value | € | € 608,346
Exercisable options - Number (in shares) | shares | 262,500
Exercisable options - Weighted average exercise price (in EUR per share) | € 1.91
Exercisable options - Aggregate intrinsic value | € | € 608,346
Exercise price, Lower range (in EUR per share) | € 1.91

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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term of outstanding stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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