DISPOSED AND DISCONTINUED OPERATIONS - Assets and Liabilities of Discontinued Operations (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019
DISPOSED AND DISCONTINUED OPERATIONS
Cash and cash equivalents			$ 4,140
Inventories	$ 23	$ 30
Other current assets	23	30
Deferred income tax assets	269	269
Deposits and other assets	269	269
Accounts payable and other accrued expenses	122
Accrued warranty	967	914
Other accrued expenses	1,089	914
Accrued warranty	462	698
Other liabilities	191	189
Other long-term liabilities	$ 653	$ 887