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Discontinued Operations - PCT Segment Narrative (Details) - PCT Segment [Member] - Discontinued Operations [Member] - USD ($) $ in Thousands |  |  | 1 Months Ended
--- | --- | --- | ---
May 18, 2018 | May 18, 2017 | May 31, 2018 | Jul. 31, 2017 | Jun. 30, 2017 | Mar. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Subsidiary, Ownership Interest by Parent |  | 80.10% |  |  |  |
Transaction Costs Related to Sale |  | $ 6,919 |  |  |  |
Payments to Employees |  | 4,300 |  |  |  |
Retention Payments, First Retention Payment, Percent |  |  |  |  | 50.00% |
Retention Payments, Second Retention Payment, Percent | 50.00% |  | 50.00% |  |  |
Hitachi Chemical Co., LTD [Member] |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Purchase agreement, additional consideration |  | 4,400 |  |  |  |
Purchase Agreement, Potential Future Milestone Payment |  | 5,000 |  |  |  |
Cumulative Revenue Threshold for Receiving Milestone Payment |  | 125,000 |  |  |  |
Proceeds From Licensing Agreements, Initial Payment |  |  |  |  |  | $ 5,000
Proceeds From Licensing Agreements, Closing Payments |  | 65,000 |  | $ 4,400 |  |
Proceeds From Licensing Agreements, Escrow Amount |  | 5,000 |  |  |  |
PCT Allendale, LLC [Member] | Hitachi Chemical Co., LTD [Member] |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Purchase agreement, aggregate purchase price |  | $ 75,000 |  |  |  |

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