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Basis of Presentation and Summary of Significant Accounting Policies - Narrative (Details) $ / shares in Units, shares in Thousands | 1 Months Ended | 3 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2018 USD ($) | Mar. 31, 2020 USD ($) position $ / shares shares | Mar. 31, 2019 USD ($) shares | Jan. 01, 2020 USD ($) | Dec. 31, 2019 USD ($)
Property, Plant and Equipment [Line Items] |  |  |  |  |
Revenue recognized from milestone method revenue |  | $ 400,000 | $ 1,300,000 |  |
Number of positions in an unrealized loss position | position |  | 40 |  |  |
Credit losses related to available-for-sale debt securities |  | $ 0 |  |  |
Allowance for credit loss |  |  |  | $ 5,500,000 |
Increase (decrease) to allowance for credit loss during period |  | 500,000 |  |  |
Investment in Viking common stock |  | 28,258,000 |  |  | $ 48,425,000
Investment in warrants |  | $ 4,621,000 |  |  | 9,910,000
Potentially dilutive shares excluded from calculation due to anti-dilutive effect (shares) | shares |  | 10,144 | 7,015 |  |
COVID-19 |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Increase (decrease) in allowance for credit losses |  | $ 200,000 |  |  |
Share-based Compensation |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Potentially dilutive shares excluded from calculation due to anti-dilutive effect (shares) | shares |  | 600 |  |  |
Adjustment |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Stockholders' equity |  |  |  | $ 5,200,000 |
Viking Therapeutics, Inc. |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Outstanding warrants to purchase shares of Viking's common stock (shares) | shares |  | 1,500 |  |  |
Warrant exercise price (USD per share) | $ / shares |  | $ 1.50 |  |  |
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 |  | $ 38,298,000 |  |  | 38,298,000
Commercial license rights | Palvella |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Contract asset | $ 8,000,000.0 |  |  |  |
Definite lived intangible assets | $ 10,000,000.0 | $ 10,000,000 |  |  | $ 10,000,000
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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