SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - New Accounting Pronouncements (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021	Dec. 31, 2020
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Stockholders' equity attributable to parent	$ (709,576)	$ (730,408)	$ (650,818)	$ (619,688)
Additional Paid-In Capital
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Stockholders' equity attributable to parent	(867,890)	(942,091)	(894,108)	(873,201)
Accumulated Deficit
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Stockholders' equity attributable to parent	$ 157,832	211,895	$ 243,506	$ 253,875
Cumulative Effect, Period of Adoption, Adjusted Balance
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Long-term debt		64,900
Increase (decrease) in deferred income taxes		15,700
Cumulative Effect, Period of Adoption, Adjusted Balance | Additional Paid-In Capital
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Stockholders' equity attributable to parent		96,500
Cumulative Effect, Period of Adoption, Adjusted Balance | Accumulated Deficit
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Stockholders' equity attributable to parent		$ (47,200)