Fair Value Measurements Fair Value Measurements - Liabilities Measure at Fair Value for Preferred Stock (Details) - USD ($) $ in Thousands	Mar. 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, fair value, gross liability	$ 0	$ 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Other Current Liabilities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative liability, fair value, gross liability	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Other Noncurrent Liabilities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative liability, fair value, gross liability	0	0
Significant Other Observable Inputs (Level 2)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative liability, fair value, gross liability	0	0
Significant Other Observable Inputs (Level 2) | Other Current Liabilities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative liability, fair value, gross liability	0	0
Significant Other Observable Inputs (Level 2) | Other Noncurrent Liabilities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative liability, fair value, gross liability	0	0
Significant Unobservable Inputs (Level 3)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative liability, fair value, gross liability	2,474	2,295
Significant Unobservable Inputs (Level 3) | Other Current Liabilities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative liability, fair value, gross liability	1,857	60
Significant Unobservable Inputs (Level 3) | Other Noncurrent Liabilities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative liability, fair value, gross liability	$ 617	$ 2,235