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SHAREHOLDERS' EQUITY - Options Vested and Exercisable or Nonvested that are Expected to Vest (Details) $ / shares in Units, $ in Millions | 12 Months Ended
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Dec. 31, 2018 USD ($) $ / shares shares
5.00 to 10.00 |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Range of Exercise Prices, Lower Range Limit (in dollars per share) | $ 5.00
Range of Exercise Prices, Upper Range Limit (in dollars per share) | $ 10.00
Number Exercisable (in shares) | shares | 366,043
Weighted Average Exercise Price (in dollars per share) | $ 8.54
Weighted Average Remaining Contractual Life | 7 years 6 months 7 days
Aggregate Intrinsic Value (in millions) | $ | $ 5.5
10.01 to 15.00 |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Range of Exercise Prices, Lower Range Limit (in dollars per share) | $ 10.01
Range of Exercise Prices, Upper Range Limit (in dollars per share) | $ 15.00
Number Exercisable (in shares) | shares | 126,250
Weighted Average Exercise Price (in dollars per share) | $ 13.57
Weighted Average Remaining Contractual Life | 2 years 18 days
Aggregate Intrinsic Value (in millions) | $ | $ 1.3
15.01 to 20.00 |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Range of Exercise Prices, Lower Range Limit (in dollars per share) | $ 15.01
Range of Exercise Prices, Upper Range Limit (in dollars per share) | $ 20.00
Number Exercisable (in shares) | shares | 79,348
Weighted Average Exercise Price (in dollars per share) | $ 18.73
Weighted Average Remaining Contractual Life | 3 years 2 months 1 day
Aggregate Intrinsic Value (in millions) | $ | $ 0.4
20.01 to 25.00 |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Range of Exercise Prices, Lower Range Limit (in dollars per share) | $ 20.01
Range of Exercise Prices, Upper Range Limit (in dollars per share) | $ 25
Number Exercisable (in shares) | shares | 0
Weighted Average Exercise Price (in dollars per share) | $ 0.00
Weighted Average Remaining Contractual Life | 0 years
Aggregate Intrinsic Value (in millions) | $ | $ 0.0
25.01 to 30.00 |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Range of Exercise Prices, Lower Range Limit (in dollars per share) | $ 25.01
Range of Exercise Prices, Upper Range Limit (in dollars per share) | $ 30
Number Exercisable (in shares) | shares | 0
Weighted Average Exercise Price (in dollars per share) | $ 0.00
Weighted Average Remaining Contractual Life | 0 years
Aggregate Intrinsic Value (in millions) | $ | $ 0.0
30.01 to 31.66 |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Range of Exercise Prices, Lower Range Limit (in dollars per share) | $ 30.01
Range of Exercise Prices, Upper Range Limit (in dollars per share) | $ 31.66
Number Exercisable (in shares) | shares | 17,550
Weighted Average Exercise Price (in dollars per share) | $ 31.66
Weighted Average Remaining Contractual Life | 9 years 9 months 7 days
Aggregate Intrinsic Value (in millions) | $ | $ 0.0
5.00 to 31.66 |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Range of Exercise Prices, Lower Range Limit (in dollars per share) | $ 5.00
Range of Exercise Prices, Upper Range Limit (in dollars per share) | $ 31.66
Number Exercisable (in shares) | shares | 589,191
Weighted Average Exercise Price (in dollars per share) | $ 11.68
Weighted Average Remaining Contractual Life | 5 years 9 months 29 days
Aggregate Intrinsic Value (in millions) | $ | $ 7.2

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- Definition Amount by which current fair value of underlying stock exceeds exercise price of 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. + 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)(2) -URI http://asc.fasb.org/extlink&oid=109197908&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=109197908&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=109197908&loc=d3e5070-113901 + Details
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