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Fair Value of Financial Instruments Fair Value of Financial Instruments (Details 3) $ in Thousands |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 07, 2015 USD ($) | Nov. 30, 2016 USD ($) | May 31, 2018 USD ($) | May 31, 2017 USD ($)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Purchase of non-transferable warrants | $ 2,000 |  |  |
Potential amount of undiscounted future contingent consideration |  |  | $ 3,300 |
Recurring |  |  |  |
Summary showing the recurring fair value measurements of the contingent consideration liability |  |  |  |
Revenue based payments |  |  | 3,261 | $ 12,761
Level 3 | Recurring |  |  |  |
Summary showing the recurring fair value measurements of the contingent consideration liability |  |  |  |
Revenue based payments |  |  | 3,261 | $ 12,761
Revenue based payments | Level 3 | Recurring |  |  |  |
Summary showing the recurring fair value measurements of the contingent consideration liability |  |  |  |
Revenue based payments |  |  | $ 3,261 |
Revenue based payments | Level 3 | Recurring | Discount Rate |  |  |  |
Summary showing the recurring fair value measurements of the contingent consideration liability |  |  |  |
Discount rate used in fair value calculation |  |  | 0.04 |
Revenue based payments | Level 3 | Maximum | Recurring | Contingent Consideration Earn Out Liability |  |  |  |
Summary showing the recurring fair value measurements of the contingent consideration liability |  |  |  |
Probability of payment |  |  | 100.00% |
AngioVac Product |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Gain from reduction |  | $ 13,400 |  |
Discontinued Investment in TiLo Product | Disposal Group, Disposed of by Means Other than Sale, Not Discontinued Operations, Abandonment |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Gain from reduction |  |  | $ 3,100 |
Discontinued Investment in TiLo Product | Disposal Group, Disposed of by Means Other than Sale, Not Discontinued Operations, Abandonment | In Process Research and Development |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Write-down |  |  | $ 3,600 |

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