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Basis of Presentation and Summary of Significant Accounting Policies - Narrative (Details) | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2018 USD ($) | Sep. 30, 2020 USD ($) position $ / shares shares | Jun. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) shares | Sep. 30, 2020 USD ($) position $ / shares shares | Sep. 30, 2019 USD ($) shares | Jan. 01, 2020 USD ($) | Dec. 31, 2019 USD ($)
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Accounting Standards Update |  |  |  |  | us-gaap:AccountingStandardsUpdate201613Member |  |  |
Revenue recognized from milestone method revenue |  | $ 5,800,000 |  | $ 1,000,000.0 | $ 8,300,000 | $ 5,000,000.0 |  |
Fair value of equity securities |  | $ 6,581,000 |  |  | $ 6,581,000 |  |  | $ 9,910,000
Number of positions in an unrealized loss position | position |  | 2 |  |  | 2 |  |  |
Credit losses related to available-for-sale debt securities |  | $ 0 |  |  | $ 0 |  |  |
Additional allowance for credit losses recorded related to COVID-19 |  | $ (100,000) |  |  | 200,000 |  |  |
Allowance for credit loss |  |  |  |  |  |  | $ 5,500,000 |
Increase (decrease) to allowance for credit loss during period |  |  |  |  | $ 500,000 |  |  |
Potentially dilutive shares excluded from calculation due to anti-dilutive effect (shares) | shares |  | 7,028,000 |  | 11,549,000 | 8,330,000 | 8,694,000 |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-10-01 |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Expected timing of satisfaction of remaining performance obligation |  | 3 years |  |  | 3 years |  |  |
Warrants |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Fair value of equity securities |  | $ 155,000 |  |  | $ 155,000 |  |  | 125,000
Warrants | Short-term Investments |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Fair value of equity securities |  | $ 6,600,000 |  |  | $ 6,600,000 |  |  | 9,900,000
Share-based Compensation |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Potentially dilutive shares excluded from calculation due to anti-dilutive effect (shares) | shares |  | 700,000 |  | 700,000 | 650,000 |  |  |
Adjustment |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Cumulative-effect adjustment from adoption of ASU 2016-13, net of tax |  |  |  |  |  |  |  | (5,200,000)
Viking Therapeutics, Inc. |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Warrant exercise price (USD per share) | $ / shares |  | $ 1.50 |  |  | $ 1.50 |  |  |
Viking Therapeutics, Inc. | Common Stock | Short-term Investments |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Fair value of equity securities |  | $ 33,900,000 |  |  | $ 33,900,000 |  |  | 48,400,000
Palvella |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Revenue recognized from milestone method revenue |  |  | $ 3,000,000.0 |  |  |  |  |
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] |  |  |  |  |  |  |  |
Up-front payment |  | 38,298,000 |  |  | $ 38,298,000 |  |  | 38,298,000
Commercial license rights | Palvella |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Contract asset | $ 8,000,000.0 |  |  |  |  |  |  |
Up-front payment | $ 10,000,000.0 | $ 10,000,000 |  |  | $ 10,000,000 |  |  | $ 10,000,000
Minimum | Royalty Agreements | Palvella |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Royalty rate (as a percent) | 5.00% |  |  |  |  |  |  |
Maximum | Viking Therapeutics, Inc. |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Outstanding warrants to purchase shares of Viking's common stock (shares) | shares |  | 1,500,000 |  |  | 1,500,000 |  |  |
Maximum | Royalty Agreements | Palvella |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Royalty rate (as a percent) | 9.80% |  |  |  |  |  |  |

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http://asc.fasb.org/extlink&oid=115929471&loc=d3e21914-107793 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109234566&loc=d3e22644-107794 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 10 -Section 65 -Paragraph 4 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121646688&loc=SL121648383-210437 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 65 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=121370832&loc=SL117420844-207641 Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 16 -URI 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