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Fair Value Measures - Warrant Liabilities (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Common stock warrant liabilities | $ 0 | $ 77,404
2015 Private warrants |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Common stock warrant liabilities | 0 | 77,404
Carrying Amount |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Common stock warrant liabilities | 0 | 77,404
Carrying Amount | 2015 Private warrants |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Common stock warrant liabilities | 0 | 77,404
Fair Value | Level 1 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Common stock warrant liabilities | 0 | 0
Fair Value | Level 2 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Common stock warrant liabilities | 0 | 0
Fair Value | Level 3 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Common stock warrant liabilities | 0 | 77,404
Fair Value | 2015 Private warrants | Level 1 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Common stock warrant liabilities | 0 | 0
Fair Value | 2015 Private warrants | Level 2 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Common stock warrant liabilities | 0 | 0
Fair Value | 2015 Private warrants | Level 3 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Common stock warrant liabilities | $ 0 | $ 77,404

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