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RELATED PARTY TRANSACTIONS - Narrative (Details) - USD ($)	1 Months Ended	3 Months Ended		12 Months Ended
	Oct. 31, 2013	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2009	Jan. 31, 2007	Mar. 31, 2006
Related Party Transaction [Line Items]
Reimbursement Agreements termination notice period		90 days
Conversion ratio, outstanding principal amount per share of common stock issued (in dollars per share)					$ 5.21
Number of days demand registration may be postponed		30 days
Products Corporation
Related Party Transaction [Line Items]
Percentage of voting capital stock		66.00%
Registration Rights Agreement \| 2003 Equity Rights Offering
Related Party Transaction [Line Items]
Equity right offering value	$ 50,000,000.0
Registration Rights Agreement \| 2006 Equity Rights Offering
Related Party Transaction [Line Items]
Equity right offering value							$ 110,000,000
Registration Rights Agreement \| 2007 Equity Rights Offering
Related Party Transaction [Line Items]
Equity right offering value						$ 100,000,000
Class A Common Stock
Related Party Transaction [Line Items]
Shares converted in Offering	3,125,000				9,336,905
Percentage ownership of outstanding common stock		86.40%
MacAndrews & Forbes \| Reimbursements
Related Party Transaction [Line Items]
Payments to related party				$ 5,300,000
Payable to related party (less than for current period coupon redemption services)			$ 0
Related party income		$ 100,000	300,000
Receivable from related party		100,000		100,000
Majority Shareholder \| Related party expense, other advertising coupon redemption and raw material supply
Related Party Transaction [Line Items]
Payments to related party		100,000	300,000
Payable to related party (less than for current period coupon redemption services)		100,000		300,000
Related party expenses		2,500,000	$ 13,000,000.0
Majority Shareholder \| Related party expense, coupon redemption services
Related Party Transaction [Line Items]
Payable to related party (less than for current period coupon redemption services)		$ 100,000		$ 600,000