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Stockholders' Equity - Schedule of Share Based Compensation Restricted Stock Units Award Activity (Detail) - Restricted Stock Units (ZSUs) [Member] - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Nonvested Outstanding Shares, Beginning balance 59,452  
Nonvested Shares, Granted 22,210  
Nonvested Shares, Vested (20,774)  
Nonvested Shares, Forfeited (15,410)  
Nonvested Outstanding Shares, Ending balance 45,478  
Weighted Average Grant Date Fair Value, Beginning balance $ 2.66  
Weighted Average Grant Date Fair Value, Granted 3.52  
Weighted Average Grant Date Fair Value, Vested 2.83  
Weighted Average Grant Date Fair Value, Forfeited 2.67  
Weighted Average Grant Date Fair Value, Ending balance $ 3.00  
Nonvested Aggregated Intrinsic Value, Unvested $ 181,912 $ 152,792