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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

Represents the percentage of awards other than options which vest annually on the anniversary date of the award.

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