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Stockholders' Equity - Schedule of Share Based Compensation Restricted Stock Units Award Activity (Detail) - Restricted Stock Units (RSUs) [Member] - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
9 Months Ended
Sep. 30, 2020
Dec. 31, 2019
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Unvested Outstanding Shares, Beginning balance 40,188  
Unvested Shares, Granted 43,085  
Unvested Shares, Vested (13,650)  
Unvested Shares, Forfeited (1,946)  
Unvested Outstanding Shares, Ending balance 67,677  
Unvested Weighted Average Grant Date Fair Value, Beginning balance $ 4.23  
Unvested Weighted Average Grant Date Fair Value, Granted 8.60  
Unvested Weighted Average Grant Date Fair Value, Vested 4.04  
Unvested Weighted Average Grant Date Fair Value, Forfeited 4.53  
Unvested Weighted Average Grant Date Fair Value, Ending balance $ 7.04  
Unvested, Aggregate Intrinsic Value of Unvested RSU $ 619,921 $ 245,951