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Fair Value Measurements - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Jun. 30, 2020 | Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Impairment of other assets |  |  | $ 359 |  |  |
Impairment loss |  |  | 1,500 |  |  |
Investments in privately held companies | $ 12,000 |  | 12,000 |  |  | $ 17,100
Impairment of intangible assets | 18,100 | $ 2,700 | 20,500 | $ 3,300 |  |
Impairment charges | 20,585 | 2,702 | 28,305 | 3,250 |  |
Long-term notes receivable | 2,900 |  | 2,900 |  |  | 2,700
Allowance for expected credit losses | 803 |  | 803 |  | $ 757 |
Bluegrass Vascular Technologies, Inc |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Impairment charges |  |  | 3,500 |  |  |
Fusion Medical, Inc. |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Impairment of equity method investment | 2,500 |  |  |  |  |
Contingent Receivable | Contingent Consideration |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Gain (loss) on contingent receivable |  | $ (119) |  | (101) |  |
Director | Cianna Medical |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Contingent payments related to acquisition |  |  | 800 | $ 1,000 |  |
Other long-term obligations |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Contingent consideration liability, noncurrent | 50,100 |  | 50,100 |  |  | 48,100
Accrued expenses |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Contingent consideration liability, current | $ 14,500 |  | $ 14,500 |  |  | $ 28,600

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