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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, 2017
Dec. 31, 2016
Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Options Outstanding, Beginning balance 9,933,750    
Options Outstanding, Granted 9,771,500    
Options Outstanding, Forfeited and expired (6,613,000)    
Options Outstanding, Exercised 0    
Options Outstanding, Ending balance 13,092,250    
Options Outstanding, Exercisable 810,700 7,074,650 7,042,600
Options Outstanding, Vested or expected to vest 11,210,701    
Weighted Average Exercise Price, Beginning balance $ 1.00    
Weighted Average Exercise Price, Granted 0.96    
Weighted Average Exercise Price, Forfeited and expired 1.00    
Weighted Average Exercise Price, Exercised 0    
Weighted Average Exercise Price, Ending balance 0.97    
Weighted Average Exercise Price, Exercisable 1.00 $ 1.00 $ 1.00
Weighted Average Exercise Price, Vested or expected to vest $ 0.97    
Weighted-Average Remaining Contractual Life in Years, Outstanding 5 years 9 months 11 days    
Weighted-Average Remaining Contractual Life in Years, Exercisable 4 years 5 months 16 days    
Weighted-Average Remaining Contractual Life in Years, Vested or expected to vest 5 years 8 months 2 days    
Aggregate Intrinsic Value, Outstanding $ 0    
Aggregate Intrinsic Value, Exercisable 0    
Aggregate Intrinsic Value, Vested or expected to vest $ 0