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INCOME TAXES - Summary of Components of Net Deferred Tax Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Deferred Tax Assets |  |
Allowance and reserves | $ 2,432 | $ 3,811
Net operating loss carryforward | 168,691 | 167,844
Tax credit carryforwards | 6,093 | 6,451
Property, plant and equipment | 310 | 396
Stock-based compensation |  | 29
Accrued warranties | 13 | 12
Other | 13,624 | 14,052
Total deferred tax assets | 191,163 | 192,595
Deferred Tax Liabilities |  |
Deferred revenue and customer advances, net | (87) | (88)
Prepaid expense | (41) | (42)
Total deferred tax liabilities | (128) | (130)
Total net deferred tax assets | 191,035 | 192,465
Less: Valuation allowance | (190,198) | (190,334)
Total net deferred tax assets | $ 837 | $ 2,131

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