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Stock-Based Compensation (Narrative) (Details) $ / shares in Units, $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Dec. 01, 2021 tranche milestone | Dec. 31, 2021 USD ($) milestone tranche $ / shares shares | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | May 19, 2020 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Increase in number of shares reserved for future issuance (in shares) | shares |  |  |  |  | 4,860,000
Vesting period |  | 3 years |  |  |
Stock-based compensation expense |  | $ 55,153 | $ 17,725 | $ 23,587 |
Liability reduced and recorded as part of divestiture gain |  | $ 1,914 |  |  |
Vesting percentage |  | 33.33% |  |  |
Volumetric Biotechnologies, Inc. |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock-based compensation expense |  | $ 683 |  |  |
Incentive Awards |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock-based compensation expense |  | $ 22,057 |  |  |
Restricted Stock - Market Conditions |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares awarded (in shares) | shares |  | 606,000 |  |  |
Restricted Stock - Performance Measures |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares awarded (in shares) | shares |  | 747,000 |  |  |
Restricted Stock Awards and Restricted Stock Unit Awards |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock compensation expense |  | $ 60,612 |  |  |
Restricted Stock Awards and Restricted Stock Unit Awards | Weighted Average |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period |  | 2 years 9 months 18 days |  |  |
Performance Shares |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock-based compensation expense |  | $ 81 |  |  |
Number of non-financial milestones | milestone | 4 | 4 |  |  |
Number of tranches | tranche | 4 |  |  |  |
Number of tranches per milestone | tranche | 1 |  |  |  |
Number of non-financial milestones probable of achievement | milestone |  | 1 |  |  |
Stock Options and Restricted Stock Awards | 2015 Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of tranches | tranche |  | 2 |  |  |
Trading price for stock award, tranche one (in usd per share) | $ / shares |  | $ 30 |  |  |
Trading price for stock award, tranche two (in usd per share) | $ / shares |  | $ 40 |  |  |
Stock award tranche granting period |  | 90 days |  |  |
Share-based Payment Arrangement, Option |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock compensation expense |  | $ 0 |  |  |

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