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%

Effective income tax rate reconciliation tax related to contingent consideration from business combination.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the valuation allowance for deferred tax assets.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to income tax settlements. Including, but not limited to, domestic tax settlement, foreign tax settlement, state and local tax settlement, and other tax settlements.

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