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Commitments and Contingencies (Detail) - USD ($) |  | 3 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Oct. 07, 2016 | Apr. 01, 2017 | Dec. 31, 2016 | Jul. 27, 2018 | Jun. 30, 2018 | Sep. 04, 2012
Loss Contingencies [Line Items] |  |  |  |  |  |
Assessed damages |  |  |  |  |  | $ 4,000,000
Plaintiff statutory damages on individual basis | $ 25 |  |  |  |  |
Payment of settlement compensation |  | $ 8,500,000 |  |  |  |
Litigation settlement expense |  |  | $ 9,200,000 |  |  |
Minimum |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Loss contingency, range of possible loss, portion not accrued |  |  |  |  | $ 0 |
Maximum |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Loss contingency, range of possible loss, portion not accrued |  |  |  |  | $ 100,000,000 |
Subsequent Event |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Assessed damages |  |  |  | $ 4,800,000 |  |

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- Definition The difference between the maximum amount of estimated loss and the amount recorded as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 05 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6395354&loc=d3e12631-108344 + Details
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