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Commitments and Contingencies - Additional Information (Detail) € in Millions | 1 Months Ended | 3 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2012 Patents | Oct. 30, 2011 Patents | Sep. 30, 2016 USD ($) | Jul. 01, 2016 USD ($) | Apr. 01, 2016 USD ($) | Feb. 29, 2016 USD ($) | Feb. 29, 2016 EUR (€)
Other Commitments [Line Items] |  |  |  |  |  |  |
Non-cancelable purchase commitments |  |  | $ 21,700,000 |  |  |  |
Maximum amount of potential future payments under the company's financial guarantees |  |  | 700,000 |  |  |  |
Business Acquisition, Preacquisition Contingency, Amount of Settlement |  |  | 2,500,000 | $ 3,500,000 |  |  |
Business Combination, Contingent Consideration, Liability, Current |  |  | 0 |  |  |  |
Loss Contingency, Patents Allegedly Infringed, Number | Patents | 1 | 2 |  |  |  |  |
Guarantee Obligations [Member] |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |
Guarantees related to rent obligations |  |  | 1,900,000 |  |  |  |
Indemnification [Member] |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |
Accrual for indemnification provisions |  |  | 0 |  |  |  |
Israel [Member] | Guarantee Obligations [Member] |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |
Guarantees related to rent obligations |  |  | 400,000 |  |  |  |
TVN [Member] | Guarantee Obligations [Member] |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |
Guarantees related to rent obligations |  |  | 1,300,000 |  |  |  |
TVN [Member] |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |
Business Combination, Contingent Consideration, Liability |  |  | 0 |  |  |  |
Business Combination, Contingent Consideration, Liability, Current |  |  |  |  | $ 8,000,000 |  |
TVN's 2015 revenue, difference as converted from euros to US dollars [Member] | TVN [Member] |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |
Business Combination, Contingent Consideration, Liability |  |  |  |  |  | $ 75,000,000 |
TVN's 2015 revenue, difference as converted from euros to US dollars [Member] | Maximum [Member] | TVN [Member] |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |
Business Combination, Contingent Consideration, Liability |  |  |  |  |  | 83,300,000 | € 76
TVN's 2015 backlog [Member] | Maximum [Member] | TVN [Member] |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |
Business Combination, Contingent Consideration, Liability |  |  |  |  |  | $ 5,000,000 |
Cash Earnout [Member] | TVN [Member] |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |
Other Payments to Acquire Businesses |  |  | $ 2,500,000 | $ 3,500,000 |  |  |

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