Summary of Significant Accounting Policies - Summary of Weighted Average Fair Value Assumptions on Contingent Consideration (Detail) - Fair Value, Inputs, Level 3 [Member] - Rhythm Xience [Member]	Jun. 30, 2020 yr	Dec. 31, 2019 yr
Measurement Input, Risk Free Interest Rate [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Contingent consideration from the acquisition, Fair value inputs	0.002	0.016
Measurement Input, Price Volatility [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Contingent consideration from the acquisition, Fair value inputs	0.183	0.118
Minimum [Member] | Measurement Input, Maturity [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Contingent consideration from the acquisition, Fair value inputs	1.0	1.0
Maximum [Member] | Measurement Input, Maturity [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Contingent consideration from the acquisition, Fair value inputs	2.0	2.0