Acquisitions - Schedule of Consideration Paid to Icontrol and Estimated Fair Value of Tangible and Intangible Net Assets Acquired (Details) - USD ($) $ in Thousands		6 Months Ended
	Mar. 08, 2017	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Calculation of Purchase Consideration:
Assumed options from business acquisition		$ 1,375	$ 0
Estimated Tangible and Intangible Net Assets:
Goodwill		$ 64,092		$ 24,723
Connect And Piper
Calculation of Purchase Consideration:
Cash paid, net of working capital adjustment	$ 148,500
Assumed options from business acquisition	1,375
Total consideration	149,875
Estimated Tangible and Intangible Net Assets:
Cash	211
Accounts receivable	11,342
Current assets	823
Long-term assets	4,446
Current liabilities	(1,577)
Long-term liabilities	(281)
Goodwill	36,711
Total estimated tangible and intangible net assets	149,875
Connect And Piper | Customer Relationships
Estimated Tangible and Intangible Net Assets:
Intangible assets acquired	93,260
Connect And Piper | Developed Technology
Estimated Tangible and Intangible Net Assets:
Intangible assets acquired	4,770
Connect And Piper | Trade Name
Estimated Tangible and Intangible Net Assets:
Intangible assets acquired	$ 170