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Basis of Presentation and Summary of Significant Accounting Policies - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions | 1 Months Ended | 3 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2018 | Mar. 31, 2019 | Jan. 01, 2019 | Mar. 31, 2018 | Dec. 31, 2017
Property, Plant and Equipment [Line Items] |  |  |  |  |
Right-of-use assets |  | $ 4,881 |  |  |
Lease liabilities |  | 5,507 |  |  |
Total assets | $ 656,665 | 1,396,316 |  |  |
Level 1 |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Total assets | 56,774 | $ 80,181 |  |  |
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) |  | 1.5 |  |  |
Warrant exercise price (USD per share) |  | $ 1.50 |  |  |
Recurring | Level 1 | Investment in Warrants |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Total assets |  | $ 12,700 |  |  | $ 9,300
Accounting Standards Update 2016-02 |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Right-of-use assets |  |  | $ 5,200 |  |
Lease liabilities |  |  | $ 5,900 |  |
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 | $ 38,298 |  |  |
Commercial license rights | Palvella |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Contract asset | 8,000 |  |  |  |
Definite lived intangible assets | $ 10,000 | $ 10,000 |  |  |
Minimum | Royalty Agreements | Palvella |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Tiered royalty rate (as a percent) | 5.00% |  |  |  |
Maximum | Royalty Agreements | Palvella |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Tiered royalty rate (as a percent) | 9.80% |  |  |  |

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