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Revenue Recognition - Summarize Activity of the Net Product Revenue Allowance and Reserve Categories (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Valuation And Qualifying Accounts Disclosure [Line Items]
Beginning balance	$ 128,557	$ 65,244
Provision related to current period sales	585,206	369,133
Provision related to prior period sales	(3,872)	(204)
Credits/payments made for current period sales	(384,035)	(249,600)
Credits/payments made for prior period sales	(118,742)	(62,540)
Ending balance	207,114	122,033
Trade Allowances
Valuation And Qualifying Accounts Disclosure [Line Items]
Beginning balance	29,261	19,495
Provision related to current period sales	95,239	62,177
Credits/payments made for current period sales	(32,364)	(34,400)
Credits/payments made for prior period sales	(29,067)	(19,325)
Ending balance	63,069	27,947
Rebates, Chargebacks and Discounts
Valuation And Qualifying Accounts Disclosure [Line Items]
Beginning balance	90,997	41,634
Provision related to current period sales	437,030	274,439
Provision related to prior period sales	(3,872)	(204)
Credits/payments made for current period sales	(304,903)	(184,801)
Credits/payments made for prior period sales	(85,731)	(41,363)
Ending balance	133,521	89,705
Product Returns
Valuation And Qualifying Accounts Disclosure [Line Items]
Beginning balance	4,579	2,948
Provision related to current period sales	2,534	1,635
Credits/payments made for current period sales		5
Credits/payments made for prior period sales	(223)	(653)
Ending balance	6,890	3,935
Other Incentives
Valuation And Qualifying Accounts Disclosure [Line Items]
Beginning balance	3,720	1,167
Provision related to current period sales	50,403	30,882
Credits/payments made for current period sales	(46,768)	(30,404)
Credits/payments made for prior period sales	(3,721)	(1,199)
Ending balance	$ 3,634	$ 446