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Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Federal
Current
Deferred	5,453	(3,556)
Increase in valuation allowance	(5,453)	3,556
Current
Deferred	(44)	(644)
Increase in valuation allowance	44spex_IncreaseInValuationAllowanceState	644spex_IncreaseInValuationAllowanceState
Change in valuation allowance	(540900.00%)spex_ChangeInValuationAllowance	420000.00%spex_ChangeInValuationAllowance
Income tax provision (benefit)

Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of current state and local tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of deferred federal income tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of deferred state and local tax expense (benefit) pertaining to income (loss) from continuing operations.