Preliminary allocation of the estimated purchase consideration (Details) - USD ($) $ in Thousands			3 Months Ended	12 Months Ended
		Feb. 29, 2016	Jul. 01, 2016	Dec. 31, 2016	Dec. 31, 2015
Business Combination, Separately Recognized Transactions [Line Items]
Goodwill				$ 237,279	$ 197,781
TVN [Member]
Business Combination, Separately Recognized Transactions [Line Items]
Cash and cash equivalents				6,843
Accounts receivable, net				14,933
Inventories				3,462
Prepaid expenses and other current assets				2,412
Property and equipment, net				9,942
French R&D tax credit receivables (1)	[1]			26,421
Other long-term assets				2,134
Total assets				66,147
Other debts and capital lease obligations, current				8,362
Accounts payable				12,494
Deferred revenue				2,504
Accrued and other current liabilities				18,365
Other debts and capital lease obligations, long-term				16,087
Other non-current liabilities				6,467
Deferred tax liabilities				2,126
Total liabilities				66,405
Goodwill				41,670
Intangibles				41,100
Total purchase consideration		$ 84,600	$ 82,500	$ 82,512

[1] See Note 10, “Certain Balance Sheet Components-Prepaid expenses and other current assets,” for more information on French R&D tax credit receivables.