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INCOME TAXES - Summary of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Assets: |  |
Net operating loss carryforwards | $ 61,057 | $ 76,278
Research and development tax credits | 32,879 | 28,664
Deferred revenue | 7,868 | 5,755
Accrued expenses | 5,687 | 9,601
Inventory | 4,618 | 4,906
Stock-based compensation | 2,880 | 1,536
Fixed assets | 5,461 | 7,716
Other temporary differences | 2,138 | 1,943
Deferred tax assets, gross | 122,588 | 136,399
Valuation allowance | (94,980) | (101,484)
Total deferred tax assets | 27,608 | 34,915
Liabilities: |  |
Purchased intangible assets | (22,470) | (26,014)
Unremitted foreign income | (4,827) | (4,487)
Total deferred tax liabilities | (27,297) | (30,501)
Total net deferred tax assets | 311 | 4,414
Deferred income taxes - noncurrent assets | 4,959 | 9,152
Deferred income taxes - noncurrent liabilities | $ (4,648) | $ (4,738)

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