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Organization and Summary of Significant Accounting Policies - Additional Information (Detail) $ in Thousands		3 Months Ended				9 Months Ended		12 Months Ended
	Jan. 01, 2018 USD ($)	Sep. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($) Segment	Sep. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)
Organization And Summary Of Significant Accounting Policies [Line Items]
Cash and investments in marketable securities		$ 2,039,550		$ 353,220		$ 2,039,550		$ 353,220
Senior secured notes		250,000				$ 250,000
Senior secured notes, maturity date						Oct. 05, 2020
Number of operating business segment | Segment						1
Revenue recognized from contracts with customers		27,762			$ 152,928	$ 1,153,497	$ 212,245
Effective income tax rate						0.40%
Benefit of stock-based compensation windfalls						$ 2,000
Statutory income tax rate						21.00%		35.00%
India
Organization And Summary Of Significant Accounting Policies [Line Items]
Effective income tax rate					35.00%		35.00%
Royalty [Member]
Organization And Summary Of Significant Accounting Policies [Line Items]
Revenue recognized from contracts with customers		10,259			$ 9,302	$ 29,898	$ 23,953
ASC 606 [Member]
Organization And Summary Of Significant Accounting Policies [Line Items]
Adjustment to retained earnings	$ 12,700
Reduction of deferred revenue	(2,000)
ASC 606 [Member] | Calculated under Revenue Guidance in Effect before Topic 606 [Member]
Organization And Summary Of Significant Accounting Policies [Line Items]
Revenue recognized from contracts with customers		27,387				1,154,267
ASC 606 [Member] | Royalty [Member] | MOVANTIK and ADYNOVATE [Member]
Organization And Summary Of Significant Accounting Policies [Line Items]
Revenue recognized from contracts with customers			$ 11,100	$ 9,600
ASC 606 [Member] | Royalty [Member] | Calculated under Revenue Guidance in Effect before Topic 606 [Member]
Organization And Summary Of Significant Accounting Policies [Line Items]
Adjustment to retained earnings	10,700
Revenue recognized from contracts with customers		$ 9,585				$ 30,093
ASC 606 [Member] | Royalty [Member] | Calculated under Revenue Guidance in Effect before Topic 606 [Member] | MOVANTIK and ADYNOVATE [Member]
Organization And Summary Of Significant Accounting Policies [Line Items]
Adjustment to retained earnings	$ 10,700

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