Deferred Revenue (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended	12 Months Ended
	Jun. 30, 2014 Customers	Dec. 31, 2013 Customers
Deferred Revenue (Textual)
Deferred fees	$ 3,468	$ 3,666
Prepayments from future license fees [Member]
Deferred Revenue (Textual)
Deferred fees	2,500	2,500
Number of customer	4	3
Deferred engineering development fees [Member]
Deferred Revenue (Textual)
Deferred fees	$ 900	$ 1,200
Number of customer	16	21