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Subsequent Events (Details) - USD ($) | Mar. 16, 2017 | Mar. 11, 2018 | Feb. 23, 2017 | Dec. 31, 2016 | Mar. 11, 2016
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Subsequent Event [Line Items] |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  |  |  | 19.90%
Subsidiary, Ownership Interest by Parent |  |  |  |  | 80.10%
Subsequent Event [Member] |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Subsidiary, Ownership Interest by Parent | 80.10% |  |  |  |
Grants Receivable |  |  | $ 12,200,000 |  |
Grants Receivable, Current |  |  | $ 5,700,000 |  |
Hitachi America [Member] |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  |  | 19.90% | 21.00%
Hitachi America [Member] | PCT [Member] | Subsequent Event [Member] |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Proceeds From Licensing Agreements | $ 75,000,000 |  |  |  |
Forecast [Member] | Hitachi America [Member] |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Proceeds From Licensing Agreements, Initial Payment | 5,000,000 |  |  |  |
Proceeds From Licensing Agreements, Closing Payments | 5,000,000 |  |  |  |
Former director [Member] | Forecast [Member] | Dr. Preti [Member] |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Related Party Transaction, Payment for Retention Agreement in Connection with Sale, First Retention Payment | 1,375,000 |  |  |  |
Related Party Transaction, Payment for Retention Agreement in Connection with Sale, Second Retention Payment | $ 1,375,000 |  |  |  |
Related Party Transaction, Payment for Retention Agreement in Connection with Sale, Third Retention Payment, Percentage of Milestone Payment | 5.00% |  |  |  |
Related Party Transaction, Net Payments for Retention Agreement, Threshold for Tax Reimbursement Payment | $ 1,200,000 |  |  |  |
Former director [Member] | Forecast [Member] | Dr. Preti [Member] | PCT [Member] |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Deferred Compensation Arrangement with Individual, Cash Award Granted, Amount | $ 196,112 | $ 175,000 |  |  |

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- Definition Related Party Transaction, Payment for Retention Agreement in Connection with Sale, Second Retention Payment + References No definition available. + Details
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- Definition Related Party Transaction, Payment for Retention Agreement in Connection with Sale, Third Retention Payment, Percentage of Milestone Payment + References No definition available. + Details
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- Definition Carrying amount as of the balance sheet date of amounts due under the terms of governmental, corporate, or foundation grants. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.8) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Carrying amount as of the balance sheet date of amounts due under the terms of governmental, corporate, or foundation grants. For classified balance sheets, represents the current amount receivable, that is amounts expected to be collected within one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.8) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
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