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Stockholders' Equity - Schedule of Share Based Compensation Restricted Stock Units Award Activity (Detail) - Restricted Stock Units (ZSUs) [Member]
$ / shares in Units, shares in Thousands, $ in Thousands
9 Months Ended
Sep. 30, 2015
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Nonvested Outstanding Shares, Beginning balance 69,883
Nonvested Shares, Granted 33,747
Nonvested Shares, Vested (21,015)
Nonvested Shares, Forfeited and cancelled (21,717)
Nonvested Outstanding Shares, Ending balance 60,898
Weighted Average Grant Date Fair Value, Beginning balance | $ / shares $ 3.64
Weighted Average Grant Date Fair Value, Granted | $ / shares 2.80
Weighted Average Grant Date Fair Value, Vested | $ / shares 4.04
Weighted Average Grant Date Fair Value, Forfeited and cancelled | $ / shares 3.22
Weighted Average Grant Date Fair Value, Ending balance | $ / shares $ 3.18
Nonvested Aggregated Intrinsic Value, Beginning balance | $ $ 185,889
Nonvested Aggregated Intrinsic Value, Ending balance | $ $ 138,847