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DEBT - Convertible Senior Notes (Details) $ / shares in Units, $ in Thousands		12 Months Ended
	Aug. 07, 2017 USD ($) $ / shares	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Aug. 01, 2017 $ / shares
Liability component
Principal		$ 433,484	$ 433,484
Unamortized debt discount and issuance costs		(38,831)	(47,967)
Common stock
Debt
Share Price \| $ / shares					$ 13.28
2025 Notes
Debt
Debt discount		67,300
Convertible senior notes \| 2025 Notes
Liability component
Principal		192,500	192,500
Unamortized debt discount and issuance costs		(38,211)	(46,766)
Net carrying amount		154,289	145,734
Equity component, net		65,361	65,361
Interest expense
Contractual interest expense		4,813	4,813	$ 4,813
Amortization of debt issuance costs		657	601	551
Amortization of debt discount		7,898	7,230	6,618
Total interest and amortization expense		$ 13,368	$ 12,644	$ 11,982
Convertible senior notes \| 2025 Notes \| Over-Allotment Option
Debt
Loan amount	$ 17,500
Convertible senior notes \| 2025 Notes \| Private Placement
Debt
Loan amount	$ 192,500
Interest rate (as a percent)	2.50%
Convertible senior notes \| 2025 Notes \| Common stock
Debt
Conversion rate for shares of common stock per $1,000 principal	57.9240
Conversion price (dollars per share) \| $ / shares	$ 17.26
Conversion premium (as a percent)	30.00%