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Commitments and Contingencies - Narrative (Details) - USD ($) $ in Thousands | Jul. 26, 2018 | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Loss Contingencies [Line Items] |  |  |
Acquisition-related liabilities |  | $ 21,099 | $ 13,186
Subsequent Event |  |  |
Loss Contingencies [Line Items] |  |  |
Amount awarded to other party in settlement | $ 1,000 |  |
Issuance of common shares in litigation settlement (in shares) | 500,000 |  |
Additional amount to be awarded to other party in settlement, within 12 months | $ 1,000 |  |
Additional amount to be awarded to other party in settlement, within 24 months | 1,000 |  |
Acquisition-related liabilities | $ 4,000 |  |

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