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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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