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Convertible Notes and Credit Facilities - Additional Information (Detail)			12 Months Ended
		Dec. 14, 2015 shares	Dec. 31, 2017 USD ($) $ / shares shares	Dec. 31, 2016 USD ($) shares	Dec. 31, 2015 USD ($) $ / shares	Sep. 29, 2017 USD ($)
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage			4.00%	4.00%
Debt Instrument, Face Amount			$ 128,250,000	$ 128,250,000
Debt Instrument, Convertible, Conversion Ratio					173.9978
Debt Conversion, Converted Instrument, Amount			$ 1,000		$ 1,000
Debt Instrument, Convertible, Conversion Price | $ / shares			$ 5.75		$ 5.75
Proceeds from convertible debt			$ 0	$ 0	$ 128,250,000
Stock Repurchased and Retired During Period, Shares | shares			0	0
Debt Issuance Cost					4,100,000
Percentage Of Principal Amount Of Convertible Notes Is Equal To Repurchase Price			100.00%
Loans Payable to Bank	[1]		$ 20,565,000	$ 17,930,000
Stock price greater or equal 130 percent of Note Conversion Price [Member]
Debt Instrument [Line Items]
Debt Instrument, Convertible, Threshold Trading Days			20
Debt Instrument, Convertible, Threshold Consecutive Trading Days			30
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger			130.00%
Note price less than 98 percent of stock price times conversion rate [Member]
Debt Instrument [Line Items]
Debt Conversion, Converted Instrument, Amount			$ 1,000
Debt Instrument, Convertible, Threshold Trading Days			5
Debt Instrument, Convertible, Threshold Consecutive Trading Days			5
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger			98.00%
Revolving Credit Facility [Member] | Silicon Valley Bank [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Current Borrowing Capacity			$ 15,000,000			$ 15,000,000
Outstanding Borrowing Limit Based on Eligible Receivables, Percentage						85.00%
Minimum Net Worth Required for Compliance			20,000,000
Minimum Liquidity Amount on and after November 1, 2017			10,000,000
Line of Credit Facility, Fair Value of Amount Outstanding			0
Performance Guarantee [Member] | Foreign Line of Credit [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Fair Value of Amount Outstanding			0
Long-term Line of Credit			2,000,000
Privately Negotiated Transactions [Member]
Debt Instrument [Line Items]
Proceeds from convertible debt					49,900,000
Stock Repurchased and Retired During Period, Shares | shares		11,100,000
TVN [Member]
Debt Instrument [Line Items]
Proceeds from convertible debt					$ 74,200,000
Income Taxes Receivable			$ 28,500,000
Loans Backed By French Research And Development Tax Credit Receivables [Member] | TVN [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage			0.60%
Loans Payable to Bank			$ 17,700,000	14,700,000
Adjusted EURIBOR Rate, Term			1 month
Debt Instrument, Basis Spread on Variable Rate			1.30%
Loans Backed By French Government Agencies for R&D Innovation Projects [Member] | TVN [Member]
Debt Instrument [Line Items]
Loans Payable to Bank			$ 2,900,000	$ 3,200,000
London Interbank Offered Rate (LIBOR) [Member] | Revolving Credit Facility [Member] | Silicon Valley Bank [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate			2.25%
Not Comply with Liquidity Requirement [Member] | Prime Rate [Member] | Revolving Credit Facility [Member] | Silicon Valley Bank [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate			0.25%
Comply with Liquidity Requirement [Member] | Prime Rate [Member] | Revolving Credit Facility [Member] | Silicon Valley Bank [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate			0.00%
[1] backed by French R&D tax credit receivables were $17.7 million and $14.7 million as of December 31, 2017 and 2016, respectively. As of December 31, 2017, the TVN French Subsidiary had an aggregate of $28.5 million of R&D tax credit receivables from the French government from 2018 through 2021. (See Note 9, “Certain Balance Sheet Components-Prepaid expenses and other current assets,” for more information). These tax loans have a fixed rate of 0.6%, plus EURIBOR 1 month plus 1.3% and mature between 2018 through 2020. The remaining loans of $2.9 million and $3.2 million as of December 31, 2017 and 2016, respectively, primarily relate to financial support from French government agencies for R&D innovation projects at minimal interest rates and the loans outstanding at December 31, 2017 mature between 2020 through 2025.

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