OTHER SUPPLEMENTAL INFORMATION - Total Accounts Receivable, Net (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2019	Dec. 31, 2018
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Trade receivables	$ 8,121	$ 50,447
Other receivables	2,547	3,199
Total accounts receivable	10,668	53,646
Less: allowance for doubtful accounts	(3,777)	(2,064)	$ (1,935)	$ (548)
Total accounts receivable, net	$ 6,891	$ 51,582