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INCOME TAXES - Details of Significant Components of Net Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Deferred tax assets: |  |
Net operating loss carryforwards | $ 4,936 | $ 4,968
State income taxes | 1 | 1
Deferred revenue | 6,291 | 2,347
Research and development and other credits | 8,282 | 9,590
Reserves and accruals recognized in different periods | 1,128 | 3,734
Capitalized R&D expenses | 3,447 | 3,415
Depreciation and amortization | 3,636 | 472
Lease liability | 806 |
Deferred rent | 0 | 160
Other | 0 | 6
Total deferred tax assets | 28,527 | 24,693
Valuation allowance | (28,057) | (24,398)
Net deferred tax assets | 470 | 295
Right of use lease assets | (466) |
Foreign credits | (23) | (29)
Other | (40) | (17)
Net deferred tax liabilities | (529) | (46)
Net deferred taxes | $ (59) |
Net deferred taxes |  | $ 249

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