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INCOME TAXES - Summary of Components of Net Deferred Tax Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Deferred Tax Assets |  |
Allowance and reserves | $ 5,681 | $ 2,935
Prepaid expense | 93 | 95
Net operating loss carryforward | 166,297 | 162,712
Tax credit carryforwards | 6,881 | 5,660
Writedown/amortization of intangible assets and goodwill | 1 | 15
Property, plant and equipment | 815 | 4,147
Demo equipment income | 74 | 4,588
Accrued warranties | 12 | 25
Other | 13,874 | 15,193
Total deferred tax assets | 193,728 | 195,370
Deferred Tax Liabilities |  |
Deferred revenue and customer advances, net | (204) | (157)
Total deferred tax liabilities | (204) | (157)
Total net deferred tax assets | 193,524 | 195,213
Less: Valuation allowance | (189,253) | (193,788)
Total net deferred tax assets | $ 4,271 | $ 1,425

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