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Convertible Notes, Other Debts And Capital Leases - Additional Information (Detail) $ / shares in Units, € in Thousands, shares in Millions |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 14, 2015 shares | Sep. 30, 2016 USD ($) $ / shares | Dec. 31, 2015 USD ($) $ / shares | Sep. 30, 2016 EUR (€)
Debt Instrument [Line Items] |  |  |  |  |
Financing from French government agencies related to various government incentive programs (1) | [1] |  | $ 19,153,000 |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 4.00% |
Debt Issuance Costs, Gross |  |  |  | $ 4,100,000 |
Payments of Debt Issuance Costs |  |  |  | 3,500,000 |
Debt Instrument, Face Amount |  |  | $ 128,250,000 | $ 128,250,000 |
Debt Instrument, Convertible, Conversion Ratio |  |  |  | 173.9978 |
Debt Instrument, Convertible, Conversion Price | $ / shares |  |  | $ 5.75 | $ 5.75 |
Debt Conversion, Converted Instrument, Amount |  |  |  | $ 1,000 |
Percentage Of Principal Amount Of Convertible Notes Is Equal To Repurchase Price |  |  |  | 100.00% |
Debt Instrument Convertible Allocated Amount of Equity Component |  |  | $ 26,925,000 | $ 26,925,000 |
Debt Instrument, Unamortized Discount (Premium), Net |  |  |  | 4,100,000 |
Unamortized Debt Issuance Expense |  |  | 2,828,000 | 3,223,000 |
Debt Instrument Convertible Equity Component Issuance Cost |  |  | 863,000 | $ 863,000 |
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 days |
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 Instrument, Convertible, Threshold Trading Days |  |  |  | 5 |
Debt Instrument, Convertible, Threshold Consecutive Trading Days |  |  |  | 5 days |
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger |  |  |  | 98.00% |
Privately Negotiated Transactions [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Proceeds from Convertible Debt |  |  |  | $ 49,900,000 |
Stock Repurchased and Retired During Period, Shares | shares |  | 11.1 |  |  |
TVN [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Income Taxes Receivable |  |  | 25,100,000 |  |
Loans Backed By French Research And Development Tax Credit Receivables [Member] | TVN [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Financing from French government agencies related to various government incentive programs (1) | [1] |  | $ 15,600,000 |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 0.60% |  | 0.60%
Adjusted EURIBOR Rate, Term |  |  | 1 month |  |
Debt Instrument, Basis Spread on Variable Rate |  |  | 1.30% |  |
Loans From French Government For R&D Innovation Projects [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Financing from French government agencies related to various government incentive programs (1) | [1] |  | $ 3,600,000 |  |
Foreign Line of Credit [Member] | BPI France [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Maximum Advance Credit Line For Receivables |  |  | 2,200,000 |  | € 2,000
Restricted Cash and Cash Equivalents |  |  | $ 200,000 |  | 200
Foreign Line of Credit [Member] | GE Capital Cofacredit [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Secured Borrowing On Receivables, Percentage Available, Maximum |  |  | 90.00% |  |
Guarantee Fund Percentage of Qualified Customer Invoices |  |  | 10.00% |  |
Guarantee Fund on Qualified Customer Invoices |  |  | $ 100,000 |  | € 80
Holdback Reserve on Receivables, Percentage |  |  | 10.00% |  |
[1] | As of September 30, 2016, the Company’s TVN French Subsidiary had an aggregate of $19.2 million of loans due to various financing programs of French government agencies, $15.6 million of which is related to loans backed by French R&D tax credit receivables. As of September 30, 2016, the TVN French Subsidiary had an aggregate of $25.1 million of R&D tax credit receivables from the French government from 2017 through 2020. (See Note 8, “Balance Sheet Components-Prepaid expenses and other current assets” for more information). The R&D tax loans have a fixed rate of 0.6%, plus EURIBOR 1 month + 1.3% and matures between 2017 through 2019. The remaining loans of $3.6 million at September 30, 2016 primarily relates to financial support from French government agencies for R&D innovation projects at minimal interest rates and these loans mature between 2020 through 2023.

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