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The Business - Financial Information & Liquidity (Details) |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Mar. 16, 2017 USD ($) | Jul. 28, 2016 | Dec. 31, 2016 USD ($) $ / shares | Dec. 31, 2015 USD ($) $ / shares | Mar. 11, 2016
Subsequent Event [Line Items] |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  |  |  | 19.90%
Subsidiary, Ownership Interest by Parent |  |  |  |  | 80.10%
Stock Split, Conversion Ratio |  | 0.1 |  |  |
Net loss |  |  | $ (33,309,533) | $ (81,010,501) |
Net Cash Provided by (Used in) Operating Activities |  |  | (23,667,682) | (39,258,331) |
Accumulated deficit |  |  | $ (404,788,809) | $ (372,132,490) |
Hitachi America [Member] |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  | 19.90% |  | 21.00%
Subsequent Event [Member] |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Subsidiary, Ownership Interest by Parent | 80.10% |  |  |  |
Subsequent Event [Member] | Hitachi America [Member] | PCT Allendale, LLC [Member] |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Proceeds From Licensing Agreements | $ 75,000,000 |  |  |  |
Forecast [Member] |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Equity Method Investment, Ownership Percentage, If Agreement Is Terminated | 26.02% |  |  |  |
Equity Method Investment, Ownership Percentage, If Initial Payment and Termination Fee Not Paid | 32.22% |  |  |  |
Forecast [Member] | Hitachi America [Member] |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Loss on Contract Termination | $ 5,000,000 |  |  |  |
Proceeds From Licensing Agreements, Milestone Payments | 5,000,000 |  |  |  |
Proceeds From Licensing Agreements, Initial Payment | $ 5,000,000 |  |  |  |
Common Stock [Member] |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Common stock, par value (USD per share) | $ / shares |  |  | $ 0.001 | $ 0.001 |

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