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STOCKHOLDERS' EQUITY - Stock Options (Details) - Stock options $ / shares in Units, shares in Millions, $ in Millions | 9 Months Ended
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Sep. 30, 2018 USD ($) $ / shares shares | Sep. 30, 2017 USD ($) $ / shares shares
Employee |  |
Stock-based compensation |  |
Vesting period | 3 years |
Percentage of awards vesting on the annual anniversary date of the grant | 33.33 |
Expiration term | 10 years |
2016 Incentive Plan |  |
Stock-based compensation |  |
Exercise of stock options | $ | $ 0.3 |
Unrecognized compensation expense stock option | $ | $ 7.1 | $ 17.3
Weighted average remaining vesting period | 1 year 1 month 6 days | 1 year 6 months
2016 Incentive Plan | Employee |  |
Stock-based compensation |  |
Granted (in shares) | shares | 1.2 | 1.8
Granted (in dollars per share) | $ 5.65 | $ 7.72
2016 Incentive Plan | Employee | Minimum |  |
Stock-based compensation |  |
Granted (in dollars per share) |  | 6.55
2016 Incentive Plan | Employee | Maximum |  |
Stock-based compensation |  |
Granted (in dollars per share) |  | $ 7.75

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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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