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Restatement of Consolidated Financial Statements - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Error correction and prior-period adjustments |  |  |  |  |  |
Revenue | $ 84,859 | $ 61,717 | $ 155,241 | $ 127,494 |  |
Fair value, available-for-sale securities | 291,644 |  | 291,644 |  | $ 441,186 |
Cash and cash equivalents | 204,731 |  | 204,731 |  | 128,967 |
Marketable securities | 272,382 |  | 272,382 |  | 373,682 |
Net cash used in investing activities |  |  | 96,421 | (91,380) | (97,600) |
Adjustments |  |  |  |  |  |
Error correction and prior-period adjustments |  |  |  |  |  |
Revenue |  | 1,787 |  | 3,575 |  |
Fair value, available-for-sale securities |  |  |  |  | 7,200 |
Adjustments | Sunnyvale Facility, Second Amended |  |  |  |  |  |
Error correction and prior-period adjustments |  |  |  |  |  |
Asset retirement obligation |  |  |  |  |  | $ 1,000
As originally reported |  |  |  |  |  |
Error correction and prior-period adjustments |  |  |  |  |  |
Revenue |  | 59,930 |  | 123,919 |  |
Cash and cash equivalents |  |  |  |  | 136,100 |
Marketable securities |  |  |  |  | 366,500 |
Net cash used in investing activities |  |  |  |  | (90,400) |
Royalties |  |  |  |  |  |
Error correction and prior-period adjustments |  |  |  |  |  |
Revenue | $ 41,910 | 18,744 | $ 70,769 | 40,226 |  |
Royalties | Adjustments |  |  |  |  |  |
Error correction and prior-period adjustments |  |  |  |  |  |
Revenue |  | 1,787 |  | 3,575 | $ 3,600 | $ 3,600
Royalties | As originally reported |  |  |  |  |  |
Error correction and prior-period adjustments |  |  |  |  |  |
Revenue |  | $ 16,957 |  | $ 36,651 |  |

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