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Basis of Presentation and Summary of Significant Accounting Policies - Narrative (Details) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 USD ($) position $ / shares shares | Sep. 30, 2020 USD ($) shares | Sep. 30, 2021 USD ($) position $ / shares shares | Sep. 30, 2020 USD ($) shares | Jan. 01, 2020 USD ($)
Property, Plant and Equipment [Line Items] |  |  |  |  |
Revenue recognized from milestone method revenue | $ 7,700,000 | $ 5,800,000 | $ 22,800,000 | $ 8,300,000 |
Warrants outstanding (shares) | shares | 0 |  | 0 |  |
Number of positions in an unrealized loss position | position | 11 |  | 11 |  |
Credit losses related to available-for-sale debt securities | $ 0 |  | $ 0 |  |
Additional allowance for credit losses recorded related to COVID-19 | 10,000.00 |  | 100,000 |  |
Advances on inventory purchases | 50,200,000 |  | 50,200,000 |  |
Credits applied on advances on inventory purchases | $ 24,400,000 |  | $ 24,400,000 |  |
Allowance for credit loss |  |  |  |  | $ 5,500,000
Potentially dilutive shares excluded from calculation due to anti-dilutive effect (in shares) | shares | 5,574,000 | 7,028,000 | 4,984,000 | 8,330,000 |
Share-based Compensation |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Potentially dilutive shares excluded from calculation due to anti-dilutive effect (in shares) | shares |  | 700,000 |  | 650,000 |
Restricted Stock Awards |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Performance period for awards |  |  | 3 years |  |
Royalty Agreements | Aziyo |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Effective interest rate for forecasted cash flows (as a percent) |  |  | 23.00% |  |
Royalty Agreements | Selexis |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Effective interest rate for forecasted cash flows (as a percent) |  |  | 21.00% |  |
Maximum | Restricted Stock Awards |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Payout range (as a percent) |  |  | 200.00% |  |
Minimum | Restricted Stock Awards |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Payout range (as a percent) |  |  | 0.00% |  |
Viking Therapeutics, Inc. |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Warrant exercise price (USD per share) | $ / shares | $ 1.5 |  | $ 1.5 |  |
Viking Therapeutics, Inc. | Maximum |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Outstanding warrants to purchase shares of Viking's common stock (shares) | shares | 1,500,000 |  | 1,500,000 |  |

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