DISCONTINUED OPERATIONS - Balance Sheets Information of Installation Services and Other Discontinued Activities (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Sep. 30, 2021
Assets of discontinued operations:
Prepaid and other current assets	$ 583	$ 605
Other long-term assets	3,375	3,424
Total assets of discontinued operations	3,958	4,029
Liabilities of discontinued operations:
Accrued liabilities, current	3,095	3,280
Other long-term liabilities	3,740	3,794
Total liabilities of discontinued operations	$ 6,835	$ 7,074