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Termination of Merger with Illumina (Narrative) (Details) - USD ($) |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Jan. 02, 2020 | Feb. 28, 2021 | Apr. 30, 2020 | Mar. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2019 | Feb. 16, 2021
Merger Termination [Line Items] |  |  |  |  |  |  |  |  |
Continuation Advances |  |  |  |  |  | $ 34,000,000.0 | $ 18,000,000.0 |  |
Gain (loss) from Continuation Advances |  |  |  | $ (52,000,000) |  | 34,000,000 |  | $ 18,000,000.0 |
Possible Continuation Advances payable |  |  |  |  |  | $ 52,000,000.0 |  |  |
Period in which company must repay continuation advances if change-of-control transaction is entered into with third party |  |  |  |  |  | 2 years |  |  |
Equity or debt financing that must be raised in a single transaction |  |  |  |  |  | $ 100,000,000 |  |  |
Continuation Advances paid |  | $ 52,000,000.0 |  |  |  |  |  |  |
Termination fee received | $ 98,000,000.0 |  |  |  |  |  |  |  |
Advisor fees paid |  |  | $ 6,000,000.0 |  |  |  |  |  |
Other income, net |  |  |  | $ 64,000 | $ 98,000,000.0 | $ 238,000 |  |  |
Convertible Senior Notes [Member] |  |  |  |  |  |  |  |  |
Merger Termination [Line Items] |  |  |  |  |  |  |  |  |
Principal amount of notes |  | $ 900,000,000 |  |  |  |  |  |  |
Debt instrument, stated interest rate |  | 1.50% |  |  |  |  |  |  | 1.50%
Maturity date |  |  |  | Feb. 15, 2028 |  |  |  |  |

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