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Stock-Based Compensation and Employee Benefit Plans - Summary of the Activity under the Picor Stock Option Plans (Detail) - Picor 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 9,530,987    
Options Outstanding, Granted 673,000    
Options Outstanding, Forfeited and expired (126,000)    
Options Outstanding, Exercised (12,000)    
Options Outstanding, Ending balance 10,065,987    
Options Outstanding, Exercisable 8,384,987 7,915,219 8,053,490
Options Outstanding, Vested or expected to vest 9,996,810    
Weighted Average Exercise Price, Beginning balance $ 0.62    
Weighted Average Exercise Price, Granted 0.62    
Weighted Average Exercise Price, Forfeited and expired 0.73    
Weighted Average Exercise Price, Exercised 0.41    
Weighted Average Exercise Price, Ending balance 0.62    
Weighted Average Exercise Price, Exercisable 0.61 $ 0.62 $ 0.64
Weighted Average Exercise Price, Vested or expected to vest $ 0.62    
Weighted-Average Remaining Contractual Life in Years, Outstanding 3 years 9 months 18 days    
Weighted-Average Remaining Contractual Life in Years, Exercisable 3 years 3 months 22 days    
Weighted-Average Remaining Contractual Life in Years, Vested or expected to vest 3 years 9 months 11 days    
Aggregate Intrinsic Value, Outstanding $ 493    
Aggregate Intrinsic Value, Exercisable 400    
Aggregate Intrinsic Value, Vested or expected to vest $ 492