Stockholders' Equity (Details 6) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Stockholders Equity Details 6
Employee restricted stock awards	$ 49us-gaap_RestrictedStockAwardForfeitures	$ 6us-gaap_RestrictedStockAwardForfeitures
Employee stock option awards	12,403spex_EmployeeStockOptionAwards	8,696spex_EmployeeStockOptionAwards
Non-employee restricted stock awards	176spex_NonemployeeRestrictedStockAwards	937spex_NonemployeeRestrictedStockAwards
Non-employee option awards	48spex_NonemployeeOptionAwards	332spex_NonemployeeOptionAwards
Total compensation expense	$ 12,676	$ 9,971

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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