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Equity Plans and Stock-Based Compensation - Option Activity under Stock-Based Compensation Plans (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2023
Dec. 31, 2022
Shares Underlying Outstanding Options    
Beginning balance 9,339  
Options granted 1,663  
Options exercised (41)  
Options forfeited (unvested) (29)  
Options expired (vested) (197)  
Ending balance 10,735 9,339
Vested and expected to vest as of March 31, 2023 10,435  
Exercisable as of March 31 2023 6,281  
Weighted-Average Exercise Price Per Share    
Beginning balance $ 10.70  
Options granted 11.10  
Options exercised 5.84  
Options forfeited (unvested) 10.16  
Options expired (vested) 22.83  
Ending balance 10.56 $ 10.70
Vested and expected to vest as of March 31, 2023 10.53  
Exercisable as of March 31 2023 $ 9.89  
Weighted-Average Remaining Contractual Term (years)    
Weighted - Average Remaining Contractual Term (years), balance 4 years 10 months 2 days 4 years 7 months 9 days
Vested and expected to vest as of March 31, 2023 4 years 9 months 14 days  
Exercisable as of March 31 2023 3 years 11 months 26 days  
Aggregate Intrinsic Value    
Balance as of December 31, 2022 $ 16,291  
Balance as of March 31, 2023 11,820 $ 16,291
Vested and expected to vest as of March 31, 2023 11,808  
Exercisable as of March 31 2023 $ 11,049