DISCONTINUED OPERATIONS - Balance Sheets Information (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Sep. 30, 2020
Assets of discontinued operations:
Prepaid and other current assets	$ 1,591	$ 2,091
Other long-term assets	5,397	6,406
Total assets of discontinued operations	6,988	8,497
Liabilities of discontinued operations:
Accrued liabilities, current	4,842	3,797
Other long-term liabilities	5,504	7,014
Total liabilities of discontinued operations	$ 10,346	$ 10,811