Income Taxes (Details Narrative) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Change in valuation allowance	$ (3,578)	$ (17,211)
Net operating loss carryovers	$ 37,500
Net operating loss carryovers expire	2029 through 2036
Previously unidentified loss benefits	$ 3,000

Amount of an unrecognized tax benefit that is directly related to a position taken in a tax year that results in a net operating loss carryforward. This amount is presented as a reduction of the related deferred tax asset in the balance sheet if that deferred tax asset is not used. This amount is presented separately from the deferred tax asset for a net operating loss carryforward if this unrelated tax benefit is associated with a different tax position.

No definition available.

Name:	spex_PreviouslyUnidentifiedLossBenefits
Namespace Prefix:	spex_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant