Description Of Business (Details)	12 Months Ended
	Dec. 31, 2015 USD ($) item	Dec. 31, 2014 USD ($)
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Cumulative net losses | $	$ (465,958,678)	$ (458,605,903)
Installed base | item	125
Minimum [Member]
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Annual plan percentage to rebalance and reduce operating expenses	15.00%
Maximum [Member]
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Annual plan percentage to rebalance and reduce operating expenses	20.00%
Revolving Credit Facility [Member]
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Line of credit maturity date	Mar. 31, 2018