Fair Value - Fair value of warrant liability (Details) - Level 3 - Valuation Technique, Option Pricing Model	Mar. 31, 2021
Expected volatility | Warrant Liability
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Weighted average significant input for fair value measurement	46.53
Expected volatility | Contingent Value Rights Liability
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Weighted average significant input for fair value measurement	48.80
Risk free interest rates | Warrant Liability
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Weighted average significant input for fair value measurement	0.24
Risk free interest rates | Contingent Value Rights Liability
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Weighted average significant input for fair value measurement	0.04
Expected term (in years) | Warrant Liability
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Weighted average significant input for fair value measurement	2.4
Expected term (in years) | Contingent Value Rights Liability
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Weighted average significant input for fair value measurement	0.4
Annual dividend yield | Warrant Liability
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Weighted average significant input for fair value measurement	0.94
Annual dividend yield | Contingent Value Rights Liability
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Weighted average significant input for fair value measurement	0.61