FAIR VALUE MEASUREMENTS - Narrative (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Dec. 31, 2021	Sep. 30, 2021	Jan. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Increase in liability as a result of increasing the profit element and risk premium input by 100 basis points	$ 600
Decrease in liability as a result of decreasing the profit element and risk premium input by 100 basis points	600
Increase in liability as a result of decreasing the discount rate by 100 basis points	2,500
Decrease in liability as a result of increasing the discount rate by 100 basis points	2,800
Debt Securities, One
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in debt securities				$ 25,000
Debt Securities, Two
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in debt securities			$ 13,000
Level 2 | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in debt securities	0	$ 0
Level 2 | Recurring | Convertible Notes | Notes due 2028
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notes payable fair value	568,200
Level 2 | Recurring | Convertible Notes | Notes due 2026
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notes payable fair value	611,900
Level 2 | Recurring | Convertible Notes | Notes due 2025
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notes payable fair value	$ 256,500