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Income Taxes - Schedule of Effective Income Tax Rate Reconciliation for Continuing Operations (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Tax Disclosure [Abstract] |  |  |  |  |
Statutory U.S. federal income tax rate |  | $ (77) | $ (5,680) | $ 4,806 |
State taxes, net of U.S. federal benefit |  | 1,151 | 1,043 | 1,038 |
Foreign rate differential, including withholding taxes |  | (147) | 131 | 784 |
Valuation allowances, net |  | 14,514 | (165) | 4,116 |
Research credits |  | (982) | (829) | (710) |
Italian subsidiary intangible asset |  |  |  | (230) |
Unrecognized tax benefits, net of settlements |  | (17,321) | (2,745) | 81 |
Impact of the Tax Act | $ (600) |  |  | (560) |
Equity compensation |  | 1,657 | 626 | (1,646) |
Executive compensation |  | 375 | 1,504 | 606 |
Contingent consideration |  | (1,460) | 5,678 | 528 |
Other, net |  | (595) | 1,850 | 261 |
Income tax expense (benefit) |  | $ (2,885) | $ 1,413 | $ 9,074 |
Statutory U.S. federal income tax rate |  | 21.00% | 21.00% | 21.00% | 35.00%
State taxes, net of U.S. federal benefit |  | (312.80%) | (3.90%) | 4.50% |
Foreign rate differential, including withholding taxes |  | 40.00% | (0.50%) | 3.40% |
Valuation allowances, net |  | (3944.00%) | 0.60% | 18.00% |
Research credits |  | 266.80% | 3.10% | (3.10%) |
Italian subsidiary intangible asset |  |  |  | (1.00%) |
Unrecognized tax benefits, net of settlements |  | 4706.80% | 10.10% | 0.40% |
Impact of the Tax Act |  |  |  | (2.40%) |
Equity compensation |  | (450.30%) | (2.30%) | (7.20%) |
Executive compensation |  | (101.90%) | (5.60%) | 2.60% |
Contingent consideration |  | 396.70% | (21.00%) | 2.30% |
Other, net |  | 161.70% | (6.70%) | 1.20% |
Income tax expense (benefit) /effective rate |  | 784.00% | (5.20%) | 39.70% |

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