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Equity Incentive Plans - Summary of Changes in Outstanding Options (Detail) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Options exercised (114,000) (215,300) (425,505)
Performance Based Stock Options [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Options outstanding beginning balance 6,318,717 6,927,174 8,024,761
Options granted 300,000 337,000 187,080
Options exercised (114,000) (215,300) (425,505)
Options forfeited (3,216,984) (730,157) (859,162)
Options outstanding ending balance 3,287,733 6,318,717 6,927,174
Options exercisable 2,952,075    
Expected to vest (excluding performance-based options) 329,411    
Average exercise price outstanding beginning balance $ 8.95 $ 9.39  
Average exercise price granted 3.67 6.43 $ 14.63
Average exercise price exercised 5.04 5.33 5.33
Average exercise price forfeited 5.99 13.00 7.84
Average exercise price outstanding ending balance 7.63 8.95 9.39
Average exercise price expected to vest 10.49    
Average exercise price expected to vest 8.40    
Options, Average grant date fair value $ 5.04 $ 2.16 $ 4.98
Aggregate intrinsic value outstanding ending balance $ 41,545 $ 41,784 $ 4,089
Aggregate intrinsic value exercisable (28,698)    
Aggregate intrinsic value expected to vest $ (2,346)    
Weighted average remaining contractual term outstanding ending balance 3 years 3 months 18 days 4 years 4 months 24 days 5 years 2 months 12 days
Weighted average remaining contractual term exercisable 3 years 9 months 18 days    
Weighted average remaining contractual term expected to vest 7 years 8 months 12 days