Certain Balance Sheet Components Certain Balance Sheet Components - Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands		Dec. 31, 2016	Dec. 31, 2015
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Deferred cost of revenue		$ 6,856	$ 4,601
French R&D tax credits receivables (1)	[1]	5,895	0
Prepaid maintenance, royalty, rent, property taxes and value added tax		5,526	7,167
Prepaid customer incentive (2)	[2]	1,162	0
Restricted cash (3)	[3]	731	1,093
Prepaid inventories to contract manufacturer (4)	[4]	0	8,500
Other		6,149	3,642
Prepaid Expense and Other Assets, Current		$ 26,319	$ 25,003

[1] The Company’s acquired TVN subsidiary in France (the “TVN French Subsidiary”) participates in the French Crédit d’Impôt Recherche (“CIR”) program (the “R&D tax credits”) which allows companies to monetize eligible research expenses. The R&D tax credits can be used to offset against income tax payable to the French government in each of the four years after being incurred, or if not utilized, are recoverable in cash. The amount of R&D tax credits recoverable are subject to audit by the French government and during the second quarter of 2016, the French government approved the 2012 claim and refunded $5.8 million to the TVN French Subsidiary. The remaining R&D tax credit receivables at December 31, 2016 were approximately $25.7 million and are expected to be recoverable from 2017 through 2020 with $5.9 million reported under “Prepaid and other Current Assets” and $19.8 million reported under “Other Long-term Assets” on the Company’s Consolidated Balance Sheets.

[2] On September 26, 2016, the Company granted a warrant to purchase shares of common stock (the “Warrant”) to Comcast pursuant to which Comcast may, subject to certain vesting provisions. The Warrant issued to Comcast is considered an incentive for Comcast to purchase certain of the Company’s products. Therefore the value of the Warrant will be recorded as a reduction in the Company’s net revenues to the extent such value does not exceed net revenues from pertinent sales to Comcast. The portion of the Warrant which vested on September 26, 2016 had a value of $1.6 million and is deemed a customer incentive paid upfront and in the fourth quarter of 2016, $0.4 million of this prepaid incentive has been recorded as a reduction to the Company’s 2016 net revenues from Comcast and remaining $1.2 million of this prepaid incentive is recorded as an asset under “Prepaid expenses and other current assets” on the Company’s Consolidated Balance Sheet as of December 31, 2016.

[3] The restricted cash balances are held as cash collateral security for certain bank guarantees. These restricted funds are invested in bank deposits and cannot be withdrawn from the Company’s accounts without the prior written consent of the applicable secured party. Additionally, as of December 31, 2016, the Company had approximately $1.1 million of restricted cash for the bank guarantee associated with the TVN French Subsidiary’s office building lease. This amount is reported under “Other Long-term Assets” on the Company’s Consolidated Balance Sheets.

[4] From time to time, the Company makes advance payment to a supplier for future inventory in order to secure more favorable pricing. The advance payment balance at December 31, 2015 was fully offset in 2016 against the accounts payable owed to this supplier. No advance payment to this supplier was outstanding at December 31, 2016.