Patent related income (Detail Textuals) (USD $)	3 Months Ended	9 Months Ended		1 Months Ended	3 Months Ended	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2014	Sep. 30, 2013	Jul. 21, 2014 DSL diagnostic technology	Sep. 30, 2014 DSL diagnostic technology	Sep. 30, 2014 DSL diagnostic technology
Finite-Lived Intangible Assets [Line Items]
Proceeds from sale of portion of patent portfolio				$ 2,600,000
Transaction cost from sale				500,000
Gain on sale of patent assets		2,127,000			2,100,000	2,100,000
Patent related income	$ 2,127,000	$ 2,127,000	$ 780,000