RECEIVABLES - Narrative (Details) - USD ($)	6 Months Ended	12 Months Ended
Jun. 30, 2021	Dec. 31, 2020
Receivables [Abstract]
Allowance for doubtful accounts	$ 0	$ 0
Notes Receivable
Concentration Risk [Line Items]
Maximum amount of loss	5,100,000
Loss recorded	$ 3,000,000.0
Customer concentration \| Total receivables \| Apple, Inc.
Concentration Risk [Line Items]
Concentration percentage	57.80%	48.90%
Customer concentration \| Total receivables \| Google, Inc.
Concentration Risk [Line Items]
Concentration percentage	26.30%	42.70%
Customer concentration \| Total notes receivable \| Notes Receivable
Concentration Risk [Line Items]
Concentration percentage	93.50%
Customer concentration \| Total notes receivable \| Notes Receivable \| Certain intellectual property created, developed or acquired by the developers
Concentration Risk [Line Items]
Concentration percentage	40.00%

Amount of allowance for credit loss on accounts receivable, classified as current.

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