Fair Value Measurements - Fair Value of Preferred Stock Derivative (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative liability	$ 0	$ 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Derivative liability - other current liabilities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative liability	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Derivative liability - other non-current liabilities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative liability	0	0
Significant Other Observable Inputs (Level 2)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative liability	0	0
Significant Other Observable Inputs (Level 2) | Derivative liability - other current liabilities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative liability	0	0
Significant Other Observable Inputs (Level 2) | Derivative liability - other non-current liabilities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative liability	0	0
Significant Unobservable Inputs (Level 3)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative liability	3,117	2,295
Significant Unobservable Inputs (Level 3) | Derivative liability - other current liabilities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative liability	2,453	60
Significant Unobservable Inputs (Level 3) | Derivative liability - other non-current liabilities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative liability	$ 664	$ 2,235