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Stock-Based Compensation and Employee Benefit Plans - Summary of the Activity under the VI Chip Stock Option Plans (Detail) - Vi Chip Plan [Member] - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Options Outstanding, Beginning balance 10,097,500    
Options Outstanding, Granted 5,000    
Options Outstanding, Forfeited and expired (168,750)    
Options Outstanding, Exercised 0    
Options Outstanding, Ending balance 9,933,750    
Options Outstanding, Exercisable 7,074,650 7,042,600 7,377,950
Options Outstanding, Vested or expected to vest 9,747,034    
Weighted Average Exercise Price, Beginning balance $ 1.00    
Weighted Average Exercise Price, Granted 1.00    
Weighted Average Exercise Price, Forfeited and expired 1.00    
Weighted Average Exercise Price, Exercised 0    
Weighted Average Exercise Price, Ending balance 1.00    
Weighted Average Exercise Price, Exercisable 1.00 $ 1.00 $ 1.00
Weighted Average Exercise Price, Vested or expected to vest $ 1.00    
Weighted-Average Remaining Contractual Life in Years, Outstanding 1 year 10 months 17 days    
Weighted-Average Remaining Contractual Life in Years, Exercisable 10 months 17 days    
Weighted-Average Remaining Contractual Life in Years, Vested or expected to vest 1 year 9 months 29 days    
Aggregate Intrinsic Value, Outstanding $ 0    
Aggregate Intrinsic Value, Exercisable 0    
Aggregate Intrinsic Value, Vested or expected to vest $ 0