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Commitments and Contingencies - Legal Matters (Details) - USD ($) $ in Thousands | Mar. 31, 2017 | May 31, 2017
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Settled Litigation | Melcher Litigation |  |
Loss Contingencies [Line Items] |  |
Litigation settlement amount awarded to other party | $ 1,700 |
Indemnification Agreement |  |
Loss Contingencies [Line Items] |  |
Estimate of possible loss |  | $ 62

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