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Stock-Based Compensation - Summary of Restricted Stock Unit Activity (Detail) - Restricted Stock Units (RSUs) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Equity Instruments Other than Options, Nonvested, Number of Shares    
Restricted stock units outstanding (shares), beginning balance 2,731,758  
Granted (shares) 3,762,725  
Vested and converted to shares (shares) (1,197,760)  
Forfeited (shares) (138,488)  
Restricted stock units outstanding (shares), ending balance 5,158,235 2,731,758
Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value    
Restricted stock units outstanding (usd per share), beginning balance $ 5.02  
Granted (usd per share) 2.06  
Vested and converted to shares (usd per share) 6.25  
Forfeited (usd per share) 3.45  
Restricted stock units outstanding (usd per share), ending balance $ 2.62 $ 5.02
Weighted average remaining contractual term options outstanding (years) 11 months 12 days 10 months 24 days
Restricted stock units outstanding, aggregate intrinsic value $ 28.2 $ 5.7
Restricted stock units vested and outstanding (shares) 290,324  
Restricted stock units vested and outstanding (usd per share) $ 3.27  
Restricted stock units vested and outstanding, aggregate intrinsic value $ 1.6