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INCOME TAXES - Summary of Components of Net Deferred Tax Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Deferred Tax Assets |  |
Allowance and reserves | $ 2,935 | $ (10,671)
Prepaid expense | 95 | 28
Net operating loss carryforward | 162,712 | 164,512
Tax credit carryforwards | 5,660 | 32,958
Writedown/amortization of intangible assets and goodwill | 15 | 241
Property, plant and equipment | 4,147 | 3,500
Demo equipment income | 4,588 | 4,439
Accrued warranties | 25 | (302)
Other | 15,193 | 14,205
Total deferred tax assets | 195,370 | 208,910
Deferred Tax Liabilities |  |
Deferred revenue and customer advances, net | (157) | 27
Total deferred tax liabilities | (157) | 27
Total net deferred tax assets | 195,213 | 208,937
Less: Valuation Allowance | (193,788) | (206,630)
Total net deferred tax assets | $ 1,425 | $ 2,307

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