Business Acquisition - Allocation of Net Tangible and Intangible Assets (Details) - USD ($) $ in Thousands		3 Months Ended
		Dec. 31, 2016	Jun. 30, 2017
Business Combination, Separately Recognized Transactions [Line Items]
Goodwill		$ 237,279	$ 240,570
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		$ 82,512

[1] (1) See Note 8, “Balance Sheet Components-Prepaid expenses and other current assets” for more information on French R&D tax credit receivables.