Fair Value Measurements - Fair Value of Liability Preferred Stock (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative liability, fair value, gross liability	$ 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, fair value, gross liability	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, fair value, gross liability	0
Significant Other Observable Inputs (Level 2)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative liability, fair value, gross liability	0
Significant Other Observable Inputs (Level 2) | Derivative liability - other current liabilities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative liability, fair value, gross liability	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, fair value, gross liability	0
Significant Unobservable Inputs (Level 3)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative liability, fair value, gross liability	2,295	$ 0
Significant Unobservable Inputs (Level 3) | Derivative liability - other current liabilities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative liability, fair value, gross liability	60
Significant Unobservable Inputs (Level 3) | Derivative liability - other non-current liabilities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative liability, fair value, gross liability	$ 2,235