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Consolidated Deferred Tax Assets (Liabilities) (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Temporary timing differences: |  |
Stock-based compensation expense | $ 2,874 | $ 1,662
Contingent consideration | 2,263 | 2,196
Other | 2,632 | 1,704
Total temporary timing differences | 7,769 | 5,562
Net operating loss carryforwards | 0 | 4,361
Tax business credits carryforwards | 2,004 | 1,265
Total deferred tax assets | 9,773 | 11,188
Less: Valuation allowance | (131) | (6)
Net deferred tax assets | 9,642 | 11,182
Deferred tax liabilities: |  |
Goodwill | (1,076) | (807)
Acquired intangible assets | (26,903) | (32,359)
Conversion option on convertible notes | (2,394) | (3,183)
Total deferred tax liabilities | (30,373) | (36,349)
Total net deferred tax liabilities | $ (20,731) | $ (25,167)

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