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Acquisitions - Additional Information (Detail) - USD ($) $ in Millions |  |  |  | 3 Months Ended | 4 Months Ended | 5 Months Ended | 6 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 08, 2017 | Jul. 25, 2017 | Jun. 11, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Acquired intangible assets amortize over an estimated weighted average useful life |  |  |  |  |  |  |  | 4 years 9 months 18 days |
Net revenue |  |  |  | $ 430.4 | $ 461.3 |  |  | $ 847.8 | $ 847.5
Operating loss |  |  |  | $ 24.0 | $ (28.8) |  |  | $ 40.9 | $ (34.4)
Customer Relationships [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Acquired intangible assets amortize over an estimated weighted average useful life |  |  |  |  |  |  |  | 3 years 7 months 6 days |
Backlog [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Acquired intangible assets amortize over an estimated weighted average useful life |  |  |  |  |  |  |  | 6 months |
Conexant Systems, LLC [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Acquired intangible assets |  | $ 152.5 |  |  |  |  |  |  |
Conexant Systems, LLC [Member] | Securities Purchase Agreement [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Acquisition agreement date |  |  | Jun. 11, 2017 |  |  |  |  |  |
Acquisition closing effective date |  | Jul. 25, 2017 |  |  |  |  |  |  |
Purchase price of acquisition |  | $ 305.4 |  |  |  |  |  |  |
Issuance of common stock for acquisition, shares |  | 726,666 |  |  |  |  |  |  |
Issuance of common stock for acquisition, value |  | $ 39.1 |  |  |  |  |  |  |
Business acquisition stock appreciation rights liability |  | 3.5 |  |  |  |  |  |  |
Purchase price held in escrow |  | 16.8 |  |  |  |  |  |  |
Business combination purchase price adjustment |  | 1.8 |  |  |  |  |  |  |
Business combination, consideration transferred |  | 346.2 |  |  |  |  |  |  |
Acquired intangible assets |  | $ 152.5 |  |  |  |  |  |  |
Net revenue |  |  |  |  |  |  | $ 57.4 |  |
Operating loss |  |  |  |  |  |  | $ 27.2 |  |
Conexant Systems, LLC [Member] | Securities Purchase Agreement [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Identified intangible assets included discount rates |  | 14.00% |  |  |  |  |  |  |
Conexant Systems, LLC [Member] | Securities Purchase Agreement [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Identified intangible assets included discount rates |  | 9.00% |  |  |  |  |  |  |
Conexant Systems, LLC [Member] | Securities Purchase Agreement [Member] | Developed Technology [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Acquired intangible assets |  | $ 115.3 |  |  |  |  |  |  |
Acquired intangible assets amortize over an estimated weighted average useful life |  | 5 years |  |  |  |  |  |  |
Conexant Systems, LLC [Member] | Securities Purchase Agreement [Member] | Customer Relationships [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Acquired intangible assets |  | $ 32.1 |  |  |  |  |  |  |
Acquired intangible assets amortize over an estimated weighted average useful life |  | 4 years |  |  |  |  |  |  |
Conexant Systems, LLC [Member] | Securities Purchase Agreement [Member] | Trademarks [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Acquired intangible assets |  | $ 4.8 |  |  |  |  |  |  |
Acquired intangible assets amortize over an estimated weighted average useful life |  | 7 years |  |  |  |  |  |  |
Conexant Systems, LLC [Member] | Securities Purchase Agreement [Member] | Backlog [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Acquired intangible assets |  | $ 0.3 |  |  |  |  |  |  |
Conexant Systems, LLC [Member] | Securities Purchase Agreement [Member] | Backlog [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Acquired intangible assets amortize over an estimated weighted average useful life |  | 1 year |  |  |  |  |  |  |
Conexant Systems, LLC [Member] | Securities Purchase Agreement [Member] | Escrow Obligations Under Purchase Agreement [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Purchase price held in escrow |  | $ 7.0 |  |  |  |  |  |  |
Marvell Technology Group Ltd [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Acquired intangible assets | $ 45.6 |  |  |  |  |  |  |  |
Marvell Technology Group Ltd [Member] | Asset Purchase Agreement [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Acquisition agreement date |  |  | Jun. 11, 2017 |  |  |  |  |  |
Acquisition closing effective date | Sep. 08, 2017 |  |  |  |  |  |  |  |
Purchase price of acquisition | $ 93.7 |  |  |  |  |  |  |  |
Acquired intangible assets | $ 45.6 |  |  |  |  |  |  |  |
Net revenue |  |  |  |  |  | $ 63.1 |  |  |
Operating loss |  |  |  |  |  | $ 9.1 |  |  |
Marvell Technology Group Ltd [Member] | Asset Purchase Agreement [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Identified intangible assets included discount rates | 18.00% |  |  |  |  |  |  |  |
Marvell Technology Group Ltd [Member] | Asset Purchase Agreement [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Identified intangible assets included discount rates | 9.00% |  |  |  |  |  |  |  |
Marvell Technology Group Ltd [Member] | Asset Purchase Agreement [Member] | Developed Technology [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Acquired intangible assets | $ 31.7 |  |  |  |  |  |  |  |
Acquired intangible assets amortize over an estimated weighted average useful life | 4 years |  |  |  |  |  |  |  |
Marvell Technology Group Ltd [Member] | Asset Purchase Agreement [Member] | Customer Relationships [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Acquired intangible assets | $ 12.7 |  |  |  |  |  |  |  |
Acquired intangible assets amortize over an estimated weighted average useful life | 4 years |  |  |  |  |  |  |  |
Marvell Technology Group Ltd [Member] | Asset Purchase Agreement [Member] | Backlog [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Acquired intangible assets | $ 1.2 |  |  |  |  |  |  |  |
Marvell Technology Group Ltd [Member] | Asset Purchase Agreement [Member] | Backlog [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Acquired intangible assets amortize over an estimated weighted average useful life | 1 year |  |  |  |  |  |  |  |
Marvell Technology Group Ltd [Member] | Asset Purchase Agreement [Member] | In-Process Research and Development [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Acquired intangible assets | $ 14.3 |  |  |  |  |  |  |  |

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