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Discontinued Operations - PCT Segment Narrative (Details) - PCT Segment [Member] - Discontinued Operations [Member] - USD ($) $ in Thousands |  | 1 Months Ended | 3 Months Ended
--- | --- | --- | ---
May 18, 2017 | Jul. 31, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Mar. 31, 2018
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% |  | 50.00%
Retention Payments, Second Retention Payment, Percent |  |  |  |  | 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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