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STOCKHOLDERS' EQUITY - Restricted Stock (Details) - 2016 Incentive Plan - Restricted Stock - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 9 Months Ended
--- | ---
Sep. 30, 2018 | Sep. 30, 2017
Stock-based compensation |  |
Weighted average grant date price (in dollars per share) | $ 5.47 | $ 7.07
Unrecognized compensation expense other than options | $ 8.6 | $ 5.7
Weighted average remaining vesting period | 1 year 2 months 12 days | 1 year 3 months 18 days
Minimum |  |
Stock-based compensation |  |
Grant date price (in dollars per share) | $ 3.75 | $ 6.08
Maximum |  |
Stock-based compensation |  |
Grant date price (in dollars per share) | $ 5.65 | $ 7.75
Employees and non-employee directors |  |
Stock-based compensation |  |
Number of shares granted | 2.3 | 2.0
Employee |  |
Stock-based compensation |  |
Vesting period | 3 years |
Percentage of awards other than options vesting on the annual anniversary date of the grant | 33.33% |
Non-employee director |  |
Stock-based compensation |  |
Vesting period | 6 months |

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