Fair Value Measurements - Fair Value of Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of warrants	$ 12,318	$ 178,232
Private Warrant
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of warrants	12,300	53,700
Fair Value, Recurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total fair value	12,318	178,232
Fair Value, Recurring | Public Warrant
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of warrants		124,545
Fair Value, Recurring | Private Warrant
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of warrants	12,318	53,687
Level 1 | Fair Value, Recurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total fair value	0	124,545
Level 1 | Fair Value, Recurring | Public Warrant
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of warrants		124,545
Level 1 | Fair Value, Recurring | Private Warrant
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of warrants	0	0
Level 2 | Fair Value, Recurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total fair value	0	0
Level 2 | Fair Value, Recurring | Public Warrant
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of warrants		0
Level 2 | Fair Value, Recurring | Private Warrant
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of warrants	0	0
Level 3 | Fair Value, Recurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total fair value	12,318	53,687
Level 3 | Fair Value, Recurring | Public Warrant
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of warrants		0
Level 3 | Fair Value, Recurring | Private Warrant
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of warrants	$ 12,318	$ 53,687