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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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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Value of outstanding derivative securities that permit the holder the right to purchase securities (usually equity) from the issuer at a specified price.

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