Goodwill and Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Purchase Consideration:
Value of common stock and convertible preferred stock issued to sellers	$ 5,511
Tangible assets acquired:
Cash	2,662
Prepaid expenses	35
Net tangible assets acquired	2,697
Purchase consideration in excess of fair value of net tangible assets	2,814
Patent portfolios	1,102
Goodwill	$ 1,712	$ 1,712