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	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	$ 19,806	$ 11,757
Accruals for warranties issued during period	1,524	858
Changes in estimates	615	341
Settlements	(1,993)	(1,272)
Increase due to accretion expense	774	551
Other	(301)	(170)
Balance at end of period	$ 20,425	$ 12,065