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Fair value measurements - Summary of range of key assumptions used within the valuation of the awards (Detail) - Equity Participation Right Unit [Member] - Valuation Technique, Option Pricing Model [Member] - Bio Ventus LLC [Member] | Dec. 31, 2020 USD ($) Business
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Measurement Input, Expected Term [Member] |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Equity Participation Rights Unit Measurable Input | 0.4
Measurement Input, Risk Free Interest Rate [Member] |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Equity Participation Rights Unit Measurable Input | 0.10
Measurement Input, Discount for Lack of Marketability [Member] |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Equity Participation Rights Unit Measurable Input | 7.0
Maximum [Member] |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Equity Participation Rights Unit Equity Value | $ | $ 1,240,000
Maximum [Member] | Measurement Input Equity Volatility [Member] |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Equity Participation Rights Unit Measurable Input | 101.25
Minimum [Member] |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Equity Participation Rights Unit Equity Value | $ | $ 1,065,000
Minimum [Member] | Measurement Input Equity Volatility [Member] |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Equity Participation Rights Unit Measurable Input | 35.13
Weighted Average [Member] |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Equity Participation Rights Unit Equity Value | $ | $ 1,145,000
Weighted Average [Member] | Measurement Input, Expected Term [Member] |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Equity Participation Rights Unit Measurable Input | 0.4
Weighted Average [Member] | Measurement Input, Risk Free Interest Rate [Member] |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Equity Participation Rights Unit Measurable Input | 0.10
Weighted Average [Member] | Measurement Input Equity Volatility [Member] |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Equity Participation Rights Unit Measurable Input | 50.0
Weighted Average [Member] | Measurement Input, Discount for Lack of Marketability [Member] |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Equity Participation Rights Unit Measurable Input | 7.0

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