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Organization and Summary of Significant Accounting Policies - Additional Information (Detail) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) Segment | Jun. 30, 2017 USD ($) | Dec. 31, 2017 USD ($) | Jan. 01, 2018 USD ($)
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Cash and investments in marketable securities | $ 2,106,085 |  | $ 353,220 |  | $ 2,106,085 |  | $ 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 | $ 1,087,717 |  |  | $ 34,589 | $ 1,125,735 | $ 59,317 |  |
Effective income tax rate | 0.50% |  |  |  | 0.50% |  |  |
Benefit of stock-based compensation windfalls |  |  |  |  | $ 1,900 |  |  |
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 | $ 8,563 |  |  | $ 7,434 | $ 19,639 | $ 14,651 |  |
ASC 606 [Member] |  |  |  |  |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Adjustment to retained earnings |  |  |  |  |  |  |  | $ 12,700
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] | Recognition of Royalties [Member] |  |  |  |  |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Adjustment to retained earnings |  |  |  |  |  |  |  | 10,700
ASC 606 [Member] | Recognition of Royalties [Member] | MOVANTIK and ADYNOVATE [Member] |  |  |  |  |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Adjustment to retained earnings |  |  |  |  |  |  |  | 10,700
ASC 606 [Member] | Reduction of Deferred Revenue [Member] |  |  |  |  |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Adjustment to retained earnings |  |  |  |  |  |  |  | $ (2,000)

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