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Fair Value of Financial Instruments Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands | May 31, 2018 | May 31, 2017
--- | --- | ---
Financial Assets |  |
Marketable securities | $ 1,317 |
Recurring |  |
Financial Assets |  |
Short-term investments | 2,100 |
Marketable securities | 1,317 | $ 1,215
Total Financial Assets | 3,417 | 1,215
Financial Liabilities |  |
Contingent liability for acquisition earn outs | 3,261 | 12,761
Total Financial Liabilities | 3,261 | 12,761
Recurring | Level 1 |  |
Financial Assets |  |
Short-term investments | 2,100 |
Marketable securities | 0 | 0
Total Financial Assets | 2,100 | 0
Financial Liabilities |  |
Contingent liability for acquisition earn outs | 0 | 0
Total Financial Liabilities | 0 | 0
Recurring | Level 2 |  |
Financial Assets |  |
Short-term investments | 0 |
Marketable securities | 0 | 0
Total Financial Assets | 0 | 0
Financial Liabilities |  |
Contingent liability for acquisition earn outs | 0 | 0
Total Financial Liabilities | 0 | 0
Recurring | Level 3 |  |
Financial Assets |  |
Short-term investments | 0 |
Marketable securities | 1,317 | 1,215
Total Financial Assets | 1,317 | 1,215
Financial Liabilities |  |
Contingent liability for acquisition earn outs | 3,261 | 12,761
Total Financial Liabilities | $ 3,261 | $ 12,761

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