Goodwill and Other Intangible Assets (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
	Jan. 10, 2014	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Goodwill And Other Intangible Assets [Abstract]
Goodwill acquired		$ 9,032		$ 9,032		$ 9,032
Amortization expense, intangible assets		203	$ 203	407	$ 407
Goodwill, Impaired [Abstract]
Impairment changes of Goodwill		0		0
Developed Technology Rights
Goodwill And Other Intangible Assets [Abstract]
Acquired intangible assets, useful life	7 years
Finite-Lived Intangible Assets, Accumulated Amortization		$ 1,200		$ 1,200		$ 800
Bluekite Ltd | Developed Technology Rights
Goodwill And Other Intangible Assets [Abstract]
Developed technology	$ 5,700