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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, 2017 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 | 505,738
Weighted Average Exercise Price (in dollars per share) | $ 8.53
Weighted Average Remaining Contractual Life | 8 years 4 months 2 days
Aggregate Intrinsic Value (in millions) | $ | $ 12.5
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 | 306,375
Weighted Average Exercise Price (in dollars per share) | $ 13.00
Weighted Average Remaining Contractual Life | 2 years 7 months 17 days
Aggregate Intrinsic Value (in millions) | $ | $ 6.2
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 | 156,600
Weighted Average Exercise Price (in dollars per share) | $ 18.32
Weighted Average Remaining Contractual Life | 4 years 5 months 20 days
Aggregate Intrinsic Value (in millions) | $ | $ 2.3
20.01 to 20.15 |
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) | $ 24.36
Number Exercisable (in shares) | shares | 10,000
Weighted Average Exercise Price (in dollars per share) | $ 24.36
Weighted Average Remaining Contractual Life | 9 years 7 months 10 days
Aggregate Intrinsic Value (in millions) | $ | $ 0.1
5.00 to 20.15 |
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) | $ 24.36
Number Exercisable (in shares) | shares | 978,713
Weighted Average Exercise Price (in dollars per share) | $ 11.66
Weighted Average Remaining Contractual Life | 5 years 11 months 8 days
Aggregate Intrinsic Value (in millions) | $ | $ 21.1

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- Definition Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of fully vested and expected to vest options that are exercisable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(2) -URI http://asc.fasb.org/extlink&oid=6415400&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=6415400&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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