Business Combinations (Allocation of Total Purchase Considerations) (Details) - USD ($) $ in Thousands	Apr. 24, 2015	Sep. 30, 2015	Dec. 31, 2014	Dec. 31, 2013
Business Acquisition [Line Items]
Goodwill		$ 68,803	$ 16,290	$ 1,491
Chango
Business Acquisition [Line Items]
Shares of the Company's common stock	$ 72,477
Estimated fair value of contingent consideration	16,171
Fair value of stock-based awards exchanged	4,318
Cash paid	9,097
Working capital adjustment	(184)
Total purchase consideration	101,879
Cash acquired	450
Accounts receivable	13,333
Prepaid and other assets	1,025
Fixed assets	265
Intangible assets, including in process research and development of $580	52,420
Goodwill	52,513
Total assets acquired	120,006
Accounts payable and accrued expenses	5,825
Other liabilities	443
Deferred tax liability, net	11,859
Total liabilities assumed	18,127
Net assets acquired	101,879
In-process research and development | Chango
Business Acquisition [Line Items]
Intangible assets, including in process research and development of $580	$ 580