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Fair Value Measurements - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments in privately held companies | $ 14,500 |  | $ 17,100
Impairment and other charges | 3,845 | $ 0 |
Long-term notes receivable | 2,100 |  | 2,700
Allowance for expected credit losses | 670 |  |
NvisionVLE Imaging System |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Impairment of property and equipment | 359 |  |
Impairment of other assets | 81 | 211 |
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 |  | $ 20 |
Other long-term obligations |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Contingent consideration liability, noncurrent | 57,600 |  | 48,100
Accrued expenses |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Contingent consideration liability, current | $ 11,300 |  | $ 28,600

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