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Computation of Basic and Diluted Net Loss Per Share (Detail) - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure Computation Of Basic And Diluted Earnings Per Share [Abstract]      
Net loss $ (75,240) $ (152,600) $ (158,899)
Preferred stock deemed dividend   (3,267)  
Net loss allocable to common stockholders (75,240) (155,867) (158,899)
Decrease in estimated fair value of warrant liability upon revaluation (4,124) 7,500  
Net loss allocable to common stockholders, diluted $ (79,364) $ (155,867) $ (158,899)
Weighted average shares used to compute basic net loss per share allocable to common stockholders 100,753 72,024 62,362
Effect of dilutive warrants 751    
Weighted average shares used to compute net loss allocable to common stockholders per share, diluted 101,504 72,024 62,362