FAIR VALUE MEASUREMENTS - Schedule of Changes in Nonfinancial Liabilities Related to Warrant Obligations Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs (Details) - Level 3 - Recurring - Total warranty obligations measured at fair value - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	$ 11,757	$ 9,791	$ 10,332
Accruals for warranties issued during period	5,244	3,040	3,591
Changes in estimates	6,167	2,455	(4,551)
Settlements	(6,212)	(4,030)	(1,956)
Increase due to accretion expense	2,326	1,989	2,053
Other	524	(1,488)	322
Balance at end of period	$ 19,806	$ 11,757	$ 9,791