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Significant Accounting Policies - Calculation of Net Loss and Number of Shares Used to Compute Basic and Diluted Net Loss per Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Earnings Per Share [Abstract]    
Net loss—basic and diluted $ (1,626) $ (20,553)
Weighted average shares outstanding—basic and diluted 394,638 361,136
Net loss per share—basic and diluted $ 0.00 $ (0.06)