Fair Value Measurements - Quantitative information about the significant unobservable inputs (Details) - Level 3	9 Months Ended
	Sep. 30, 2020 USD ($)
Risk Adjusted Discount Rate | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Probability (as a percent)	12
Risk Adjusted Discount Rate | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Probability (as a percent)	15
Risk Adjusted Discount Rate | Weighted average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Probability (as a percent)	14
Risk Adjusted Discount Rate | Lower discount rate (-200 basis points (bps))
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value increase (decrease)	$ 103,000
Risk Adjusted Discount Rate | Higher discount rate (+100 bps)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value increase (decrease)	(117,000)
Risk Adjusted Discount Rate | Mix of 70%, 15%, and 15%
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value increase (decrease)	$ (38,000)
Settlement on September 30, 2021 | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Probability (as a percent)	60
Settlement on September 30, 2021 | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Probability (as a percent)	90
Settlement on September 30, 2021 | Weighted average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Probability (as a percent)	90
Settlement on September 30, 2021 | Mix of 70%, 15%, and 15%
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value increase (decrease)	$ (38,000)
Settlement on September 30, 2021 | Mix of 60%, 20%, and 20%
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value increase (decrease)	$ (57,000)
Settlement on December 30, 2021 | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Probability (as a percent)	5
Settlement on December 30, 2021 | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Probability (as a percent)	20
Settlement on December 30, 2021 | Weighted average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Probability (as a percent)	5
Settlement on December 30, 2021 | Mix of 60%, 20%, and 20%
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value increase (decrease)	$ (57,000)
Settlement on August 31, 2022 | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Probability (as a percent)	5
Settlement on August 31, 2022 | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Probability (as a percent)	20
Settlement on August 31, 2022 | Weighted average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Probability (as a percent)	5
Settlement on August 31, 2022 | Mix of 70%, 15%, and 15%
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value increase (decrease)	$ (38,000)
Settlement on August 31, 2022 | Mix of 60%, 20%, and 20%
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value increase (decrease)	$ (57,000)