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STOCKHOLDERS’ EQUITY - Schedule of Stock Options Outstanding and Stock Option Activity (Detail) - Parent Company - $ / shares shares in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Options
Outstanding at beginning of period (in shares)	5,645
Granted (in shares)	2,292
Forfeited (in shares)	(161)
Expired (in shares)	(81)
Outstanding at end of period (in shares)	7,695	5,645
Exercisable (in shares)	2,204
Expected to Vest (in shares)	5,491
Price
Outstanding at beginning of period (in dollars per share)	$ 18.93
Granted (in dollars per share)	9.05
Forfeited (in dollars per share)	16.42
Expired (in dollars per share)	19.00
Outstanding at end of period (in dollars per share)	16.01	$ 18.93
Exercisable (in dollars per share)	18.87
Expected to Vest (in dollars per share)	$ 14.87
Weighted Average Remaining Contractual Term
Outstanding	5 years 10 months 24 days	5 years 4 months 24 days
Exercisable	4 years 3 months 18 days
Expected to Vest	6 years 6 months

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