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Basis of Presentation and Summary of Significant Accounting Policies - Narrative (Details) - USD ($) $ / shares in Units, shares in Thousands |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 16, 2019 | Aug. 15, 2019 | May 31, 2019 | Dec. 31, 2018 | Sep. 30, 2019 | Jun. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Jan. 01, 2019 | Mar. 31, 2018 | Dec. 31, 2017
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cash flows provided by operating activities |  |  |  |  |  |  |  | $ (21,997,000) | $ 161,487,000 |  |  |
Cash flows used in financing activities |  |  |  |  |  |  |  | (401,479,000) | $ 675,670,000 |  |  |
Right-of-use assets |  |  |  | $ 0 | $ 10,280,000 |  |  | 10,280,000 |  |  |  |
Lease liabilities |  |  |  |  | 10,858,000 |  |  | 10,858,000 |  |  |  |
Revenue recognized from milestone method revenue |  |  |  |  | 1,000,000.0 |  |  | 5,000,000.0 |  |  |  |
Investment in Viking common stock |  |  |  | 46,191,000 | 41,542,000 |  |  | 41,542,000 |  |  |  |
Total assets |  |  |  | 656,665,000 | $ 924,239,000 |  |  | $ 924,239,000 |  |  |  |
Potentially dilutive shares excluded from calculation due to anti-dilutive effect (shares) |  |  |  |  | 11,549 |  | 3,126 | 8,694 | 1,789 |  |  |
Share-based Compensation |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Potentially dilutive shares excluded from calculation due to anti-dilutive effect (shares) |  |  |  |  | 700 |  |  |  |  |  |  |
Level 1 |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Investment in Viking common stock |  |  |  | 46,191,000 | $ 41,542,000 |  |  | $ 41,542,000 |  |  |  |
Total assets |  |  |  | 56,774,000 | $ 52,027,000 |  |  | $ 52,027,000 |  |  |  |
Viking Therapeutics, Inc. |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Equity ownership interest (as a percent) |  |  |  |  |  |  |  |  |  |  | 12.40% |
Outstanding warrants to purchase shares of Viking's common stock (shares) |  |  |  |  | 1,500 |  |  | 1,500 |  |  |  |
Warrant exercise price (USD per share) |  |  |  |  | $ 1.50 |  |  | $ 1.50 |  |  |  |
Recurring | Level 1 | Investment in Warrants |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total assets |  |  |  |  |  |  |  |  |  |  |  | $ 9,300,000
Accounting Standards Update 2016-02 |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Right-of-use assets |  |  |  |  |  |  |  |  |  | $ 5,200,000 |  |
Lease liabilities |  |  |  |  |  |  |  |  |  | $ 5,900,000 |  |
Royalty Agreements | Aziyo |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Effective interest rate for forecasted cash flows (as a percent) |  |  |  |  |  |  |  | 23.00% |  |  |  |
Commercial license rights |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Definite lived intangible assets |  |  |  | 36,298,000 | $ 50,298,000 |  |  | $ 50,298,000 |  |  |  |
Commercial license rights | Palvella |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Contract asset |  |  |  | 8,000,000.0 |  |  |  |  |  |  |  |
Definite lived intangible assets |  |  |  | 10,000,000 | 10,000,000 |  |  | 10,000,000 |  |  |  |
Commercial license rights | Novan |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Contract asset |  |  | $ 20,000,000.0 |  |  |  |  |  |  |  |  |
Definite lived intangible assets |  |  | $ 12,000,000.0 | $ 0 | $ 12,000,000 |  |  | $ 12,000,000 |  |  |  |
Minimum | Royalty Agreements | Palvella |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Tiered royalty rate (as a percent) |  |  |  | 5.00% |  |  |  |  |  |  |  |
Minimum | Royalty Agreements | Novan |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Tiered royalty rate (as a percent) |  |  | 7.00% |  |  |  |  |  |  |  |  |
Maximum | Royalty Agreements | Palvella |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Tiered royalty rate (as a percent) |  |  |  | 9.80% |  |  |  |  |  |  |  |
Maximum | Royalty Agreements | Novan |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Tiered royalty rate (as a percent) |  |  | 10.00% |  |  |  |  |  |  |  |  |
2019 Convertible Senior Notes | Convertible Notes |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt premium | $ 0 | $ 11,900,000 |  |  |  |  |  |  |  |  |  |
Repayments of notes | $ 0 | $ 26,300,000 |  |  |  |  |  |  |  |  |  |
Previously Reported |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Accrued Liabilities |  |  |  | $ 4,600,000 |  |  |  |  |  |  |  |
Restatement Adjustment |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cash flows provided by operating activities |  |  |  |  |  | $ 4,600,000 |  |  |  |  |  |
Cash flows used in financing activities |  |  |  |  |  | $ 4,600,000 |  |  |  |  |  |

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