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Fair Value Measurements - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Mar. 31, 2020 | Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Impairment of intangible assets | $ 2,400 | $ 548 |  |  |  |
Impairment of other assets | 88 | 46 | $ 529 | $ 257 |  |
Impairment loss | 1,500 |  |  |  |  |
Investments in privately held companies | 14,500 |  | 14,500 |  |  | $ 17,100
Impairment and other charges | 3,875 | 548 | 7,720 | 548 |  |
Long-term notes receivable | 2,800 |  | 2,800 |  |  | 2,700
Allowance for expected credit losses | 757 |  | 757 |  | $ 670 |
Bluegrass Vascular Technologies, Inc |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Impairment and other charges |  |  | 3,500 |  |  |
Contingent Receivable | Contingent Consideration |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Gain (loss) on contingent receivable |  | $ (2) |  | $ 18 |  |
Director | Cianna Medical |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Contingent payments related to acquisition |  |  | 800 |  |  |
Other long-term obligations |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Contingent consideration liability, noncurrent | 59,000 |  | 59,000 |  |  | 48,100
Accrued expenses |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Contingent consideration liability, current | $ 10,100 |  | $ 10,100 |  |  | $ 28,600

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