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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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