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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) - Recurring - Total warranty obligations measured at fair value - Level 3 - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance at beginning of period | $ 33,319 | $ 20,425 | $ 28,736 | $ 19,806
Accruals for warranties issued during period | 3,319 | 766 | 7,213 | 2,290
Changes in estimates | 2,755 | 983 | 5,338 | 1,598
Settlements | (1,910) | (1,511) | (3,825) | (3,504)
Increase due to accretion expense | 1,104 | 804 | 2,047 | 1,578
Other | (550) | (335) | (1,472) | (636)
Balance at end of period | $ 38,037 | $ 21,132 | $ 38,037 | $ 21,132

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- Definition Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Increase (Decrease) in Other + References No definition available. + Details
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- Definition Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Warranties Issued + References No definition available. + Details
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- Definition Amount of gain (loss) recognized in income from liability measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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