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STOCKHOLDERS' EQUITY - Restricted Stock (Details) - 2016 Incentive Plan - Restricted Stock - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 6 Months Ended
--- | ---
Jun. 30, 2019 | Jun. 30, 2018
Stock-based compensation |  |
Weighted average grant date price (in dollars per share) | $ 1.29 | $ 5.53
Unrecognized compensation expense other than options | $ 6.5 | $ 11.0
Weighted average remaining vesting period | 1 year 7 months 6 days | 1 year 6 months
Minimum |  |
Stock-based compensation |  |
Grant date price (in dollars per share) | $ 1.29 | $ 4.00
Maximum |  |
Stock-based compensation |  |
Grant date price (in dollars per share) | $ 1.40 | $ 5.65
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% |
Employees and non-employee directors |  |
Stock-based compensation |  |
Number of shares granted | 4.2 | 2.2
Non-employee director |  |
Stock-based compensation |  |
Vesting period | 6 months |

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