Goodwill and Other Intangible Assets (Details) - USD ($) $ in Thousands		1 Months Ended		3 Months Ended		9 Months Ended
	Jan. 10, 2014	Oct. 31, 2015	Jul. 31, 2015	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Goodwill And Other Intangible Assets [Abstract]
Impairment of Goodwill				$ 0		$ 0
Goodwill acquired				9,032		9,032		$ 9,032
Amortization expense, intangible assets				204	$ 204	611	$ 611
Payments To Acquire Businesses Net Of Cash Acquired						1,500	$ 8,874
Developed Technology Rights
Goodwill And Other Intangible Assets [Abstract]
Acquired intangible assets, useful life	7 years
Finite-Lived Intangible Assets, Accumulated Amortization				$ 1,400		$ 1,400		$ 800
Bluekite Ltd
Goodwill And Other Intangible Assets [Abstract]
Purchase price	$ 14,900
Payments To Acquire Businesses Net Of Cash Acquired			$ 1,500
Business combination consideration held back period in months	18 months
Bluekite Ltd | Contingent Consideration Classified as Equity
Goodwill And Other Intangible Assets [Abstract]
Contingent Consideration Classified as Equity, Percentage Issued		50.00%
Bluekite Ltd | Developed Technology Rights
Goodwill And Other Intangible Assets [Abstract]
Developed technology	$ 5,700