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STOCKHOLDERS' EQUITY - Restricted Stock (Details) - RSU - USD ($) $ / shares in Units, $ in Thousands, shares in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019
2016 Incentive Plan |  |  |
Stock-based compensation |  |  |
Vesting period |  |  | 3 years
Percentage of awards other than options vesting on the annual anniversary date of the grant |  |  | 33.33%
2016 Incentive Plan | Non-employee director |  |  |
Stock-based compensation |  |  |
Vesting period |  |  | 6 months
2020 Incentive Plan | Employee |  |  |
Stock-based compensation |  |  |
Number of shares granted | 0.9 | 4.2 |
Unrecognized compensation expense other than options | $ 6,400 | $ 8,200 |
Weighted average remaining vesting period |  | 1 year 9 months 18 days |
Fair value of grant (in dollars per share) |  | $ 1.29 |
2020 Incentive Plan | Employee | Tranche One |  |  |
Stock-based compensation |  |  |
Vesting period | 4 years |  |
Number of shares granted | 0.4 |  |
Fair value of grant (in dollars per share) | $ 11.89 |  |
2020 Incentive Plan | Employee | Tranche Two |  |  |
Stock-based compensation |  |  |
Number of shares granted | 0.2 |  |
Unrecognized compensation expense other than options | $ 0 |  |
Fair value of grant (in dollars per share) | $ 11.89 |  |
2020 Incentive Plan | Employee | Tranche Three |  |  |
Stock-based compensation |  |  |
Vesting period | 4 years |  |
Number of shares granted | 0.3 |  |
Fair value of grant (in dollars per share) | $ 6.48 |  |
2020 Incentive Plan | Non-employee director |  |  |
Stock-based compensation |  |  |
Weighted average remaining vesting period | 3 years 2 months 12 days |  |

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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + 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 (i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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