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Significant Components of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Deferred tax assets: |  |
Net operating loss carryforwards | $ 135,536 | $ 125,016
Research and development credit carryforwards | 28,291 | 26,705
Capitalized research and development | 12,832 | 15,293
Compensation related items | 9,843 | 8,310
Operating leases | 4,374 |
Other | 4,547 | 4,013
Total deferred tax assets | 195,423 | 179,337
Valuation allowance | (192,304) | (179,245)
Net deferred tax assets | 3,119 | 92
Deferred tax liabilities: |  |
Right-of-use assets | 3,017 |
Amortization of goodwill | 143 | 127
Total deferred tax liabilities | $ 3,160 | $ 127

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