Fair Value - Fair value of warrant liability (Details) - Level 3 - Valuation Technique, Option Pricing Model	Jun. 30, 2021
Expected volatility | Warrant Liability
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Weighted average significant input for fair value measurement	46.63
Expected volatility | Contingent Value Rights Liability
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Weighted average significant input for fair value measurement	24.15
Risk free interest rates | Warrant Liability
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Weighted average significant input for fair value measurement	0.28
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	0.05
Expected term (in years) | Warrant Liability
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Weighted average significant input for fair value measurement	2.15
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	0.15
Annual dividend yield | Warrant Liability
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Weighted average significant input for fair value measurement	0.93