FAIR VALUE MEASUREMENTS (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2021 USD ($)	Mar. 31, 2020 USD ($)	[2]	Dec. 31, 2020 USD ($)
Fair Value Disclosures [Abstract]
Unrealized derivative instrument loss	$ (16,529)	$ (61,984)	[1]
Expected timing until exercise of exchange option	5 years 2 months 12 days
Warrants outstanding, fair value	$ 1,500			$ 900
Warrants valuation adjustment	(664)	$ 1,877
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Embedded derivative	$ 155,538			$ 139,009	[3]
Interest Rate Volatility | Level 3
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Embedded derivative liability, measurement input	0.3875
Minimum | Altus Midstream Company’s Imputed Interest Rate | Level 3
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Embedded derivative liability, measurement input	0.0715
Maximum | Altus Midstream Company’s Imputed Interest Rate | Level 3
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Embedded derivative liability, measurement input	0.1251

[1] This period presented has been revised to reflect the Company’s fair value change of its underlying warrants. Refer to Note 1—Summary of Significant Accounting Policies, see the section titled Revision of Previously Issued Consolidated Financial Statements for Immaterial Adjustment for further information.

[2] This period presented has been revised to reflect the Company’s fair value change of its underlying warrants. Refer to Note 1—Summary of Significant Accounting Policies, see the section titled Revision of Previously Issued Consolidated Financial Statements for Immaterial Adjustment for further information.

[3] The Consolidated Balance Sheet as of December 31, 2020 has been derived from the audited consolidated financial statements, revised to reflect the Company’s fair value change of its underlying warrants. Refer to Note 1—Summary of Significant Accounting Policies, see the section titled Revision of Previously Issued Consolidated Financial Statements for Immaterial Adjustment for further information.