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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, 2018
Dec. 31, 2017
Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Options Outstanding, Beginning balance 13,092,250    
Options Outstanding, Granted 0    
Options Outstanding, Forfeited and expired (2,678,250)    
Options Outstanding, Exercised 0    
Options Outstanding, Ending balance 10,414,000 13,092,250  
Options Outstanding, Exercisable 2,743,400 810,700 7,074,650
Options Outstanding, Vested or expected to vest 9,853,685    
Weighted Average Exercise Price, Beginning balance $ 0.97    
Weighted Average Exercise Price, Granted 0    
Weighted Average Exercise Price, Forfeited and expired 1.00    
Weighted Average Exercise Price, Exercised 0    
Weighted Average Exercise Price, Ending balance 0.96 $ 0.97  
Weighted Average Exercise Price, Exercisable 0.97 $ 1.00 $ 1.00
Weighted Average Exercise Price, Vested or expected to vest $ 0.96    
Weighted-Average Remaining Contractual Life in Years, Outstanding 5 years 4 months 20 days    
Weighted-Average Remaining Contractual Life in Years, Exercisable 5 years 14 days    
Weighted-Average Remaining Contractual Life in Years, Vested or expected to vest   5 years 4 months 17 days  
Aggregate Intrinsic Value, Outstanding $ 0    
Aggregate Intrinsic Value, Exercisable 0    
Aggregate Intrinsic Value, Vested or expected to vest $ 0