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STOCKHOLDERS' EQUITY - Restricted Stock (Details) - RSU - USD ($) $ / shares in Units, $ in Thousands, shares in Millions	9 Months Ended
	Sep. 30, 2020	Sep. 30, 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 | Employee
Stock-based compensation
Number of shares granted		4.2
Unrecognized compensation expense other than options		$ 2,700
Weighted average remaining vesting period		1 year 3 months 18 days
Fair value of grant (in dollars per share)		$ 1.29
2016 Incentive Plan | Employee | Minimum
Stock-based compensation
Fair value of grant (in dollars per share)		1.29
2016 Incentive Plan | Employee | Maximum
Stock-based compensation
Fair value of grant (in dollars per share)		$ 1.40
2016 Incentive Plan | Non-employee director
Stock-based compensation
Vesting period		6 months
2020 Incentive Plan
Stock-based compensation
Vesting period	4 years
Percentage of awards other than options vesting on the annual anniversary date of the grant	25.00%
2020 Incentive Plan | Minimum | Tranche One
Stock-based compensation
Fair value of grant (in dollars per share)	$ 4.36
2020 Incentive Plan | Maximum | Tranche One
Stock-based compensation
Fair value of grant (in dollars per share)	$ 11.89
2020 Incentive Plan | Employee
Stock-based compensation
Number of shares granted	1.0
Unrecognized compensation expense other than options	$ 4,900
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)	$ 11.55
2020 Incentive Plan | Employee | Tranche Two
Stock-based compensation
Number of shares granted	0.2
Compensation expense recorded	$ 0
Fair value of grant (in dollars per share)	$ 11.32
2020 Incentive Plan | Employee | Tranche Three
Stock-based compensation
Number of shares granted	0.4
Fair value of grant (in dollars per share)	$ 6.13
2020 Incentive Plan | Employee | Minimum | Tranche Two
Stock-based compensation
Fair value of grant (in dollars per share)	7.88
2020 Incentive Plan | Employee | Minimum | Tranche Three
Stock-based compensation
Fair value of grant (in dollars per share)	4.05
2020 Incentive Plan | Employee | Maximum | Tranche Two
Stock-based compensation
Fair value of grant (in dollars per share)	11.89
2020 Incentive Plan | Employee | Maximum | Tranche Three
Stock-based compensation
Fair value of grant (in dollars per share)	$ 6.48
2020 Incentive Plan | Non-employee director
Stock-based compensation
Weighted average remaining vesting period	2 years 8 months 12 days

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