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Collaboration and Hitachi License Agreement - 2016 Hitachi Transaction (Details) - USD ($) $ in Millions | 12 Months Ended |
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Dec. 31, 2017 | Mar. 11, 2016
Business Acquisition [Line Items] |  |
Equity Method Investment, Ownership Percentage |  | 19.90%
Hitachi Chemical Co., LTD [Member] |  |
Business Acquisition [Line Items] |  |
Recorded Unconditional Purchase Obligation |  | $ 19.4
Unrecorded Unconditional Purchase Obligation, Maximum Quantity |  | 15.0
PCT Allendale, LLC [Member] |  |
Business Acquisition [Line Items] |  |
Contract Receivable |  | $ 5.6
PCT Allendale, LLC [Member] |  |
Business Acquisition [Line Items] |  |
Purchase Obligation |  | $ 4.4
Minimum [Member] | PCT Allendale, LLC [Member] |  |
Business Acquisition [Line Items] |  |
Length of Contract for Royalty Payments from Revenue Generated in Asia | 10 years |

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