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Fair Value Measurements - Fair Value of Contingent Consideration by Acquisition (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Business Acquisition, Contingent Consideration [Line Items] |  |
Contingent consideration | $ 89,847 | $ 89,850
Fair Value, Recurring |  |
Business Acquisition, Contingent Consideration [Line Items] |  |
Contingent consideration | 99,271 | 103,818
Fair Value, Recurring | Level 3 |  |
Business Acquisition, Contingent Consideration [Line Items] |  |
Contingent consideration | 99,271 | 103,818
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value | 99,271 | 103,818
ImThera Medical, Inc. (“ImThera”) | Fair Value, Recurring | Level 3 |  |
Business Acquisition, Contingent Consideration [Line Items] |  |
Contingent consideration | 89,426 | 89,436
CardiacAssist, Inc., doing business as TandemLife (“TandemLife”) | Fair Value, Recurring | Level 3 |  |
Business Acquisition, Contingent Consideration [Line Items] |  |
Contingent consideration | 8,942 | 8,809
Miami Instruments | Fair Value, Recurring | Level 3 |  |
Business Acquisition, Contingent Consideration [Line Items] |  |
Contingent consideration | $ 903 | $ 5,573

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