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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, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Tax Disclosure [Abstract] |  |  |  |
Statutory U.S. federal income tax rate |  | $ (5,680) | $ 4,806 | $ 12,737
State taxes, net of U.S. federal benefit |  | 1,043 | 1,038 | 1,598
Foreign rate differential, including withholding taxes |  | 131 | 784 | (3,849)
Valuation allowances, net |  | (165) | 4,116 | 3,548
Research credits |  | (829) | (710) | (397)
Italian subsidiary intangible asset |  |  | (230) | (381)
Domestic manufacturing deduction |  |  |  | (818)
Unrecognized tax benefits, net of settlements |  | (2,745) | 81 | 6,002
Impact of the Tax Act | $ (600) |  | (560) | 8,347
Equity compensation |  | 626 | (1,646) | 272
Executive compensation |  | 1,504 | 606 | 123
Contingent consideration |  | 5,678 | 528 |
Other, net |  | 1,850 | 261 | 1,918
Income tax expense |  | $ 1,413 | $ 9,074 | $ 29,100
Statutory U.S. federal income tax rate |  | 21.00% | 21.00% | 35.00%
State taxes, net of U.S. federal benefit |  | (3.90%) | 4.50% | 4.40%
Foreign rate differential, including withholding taxes |  | (0.50%) | 3.40% | (10.60%)
Valuation allowances, net |  | 0.60% | 18.00% | 9.70%
Research credits |  | 3.10% | (3.10%) | (1.10%)
Italian subsidiary intangible asset |  |  | (1.00%) | (1.00%)
Domestic manufacturing deduction |  |  |  | (2.20%)
Unrecognized tax benefits, net of settlements |  | 10.10% | 0.40% | 16.50%
Impact of the Tax Act |  |  | (2.40%) | 22.90%
Equity compensation |  | (2.30%) | (7.20%) | 0.70%
Executive compensation |  | (5.60%) | 2.60% | 0.30%
Contingent consideration |  | (21.00%) | 2.30% |
Other, net |  | (6.70%) | 1.20% | 5.40%
Income tax expense/effective rate |  | (5.20%) | 39.70% | 80.00%

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