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Stock-Based Compensation - Additional Information (Detail)
$ / shares in Units, $ in Millions
1 Months Ended 12 Months Ended
Jun. 30, 2021
shares
Jun. 30, 2020
shares
Jun. 30, 2019
shares
Dec. 31, 2021
USD ($)
Period
$ / shares
shares
Dec. 31, 2020
USD ($)
$ / shares
shares
Dec. 31, 2019
USD ($)
$ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Total intrinsic value of options exercised | $       $ 7.5 $ 7.9 $ 1.6
Stock-based compensation, expected dividend yield       0.00%    
Weighted average grant-date fair value of stock options granted | $ / shares       $ 3.51 $ 2.71 $ 2.73
Stock Options            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock-based compensation expense expected to be recognized | $       $ 7.2    
Stock-based compensation, weighted average recognition period       2 years 3 months 18 days    
Stock-based compensation, expected dividend yield       0.00% 0.00% 0.00%
Restricted Stock Units (RSUs)            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock-based compensation expense expected to be recognized | $       $ 23.7    
Stock-based compensation, weighted average recognition period       1 year 8 months 12 days    
Employee Stock Purchase Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock-based compensation, option to be granted at percentage of fair value of common stock       85.00%    
Employee Stock Purchase Plan, offering period       12 months    
Number of purchase periods within each offering period | Period       2    
Increase in shares of common stock authorized for issuance   1,500,000        
Aggregate number of shares of common stock reserved for future issuance       1,600,000    
Stock-based compensation, expected dividend yield       0.00% 0.00% 0.00%
Weighted average grant-date fair value of awards granted | $ / shares       $ 2.21 $ 1.71 $ 1.84
2008 Equity Incentive Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock-based compensation, option to be granted at percentage of fair value of common stock       100.00%    
Increase in shares of common stock authorized for issuance 7,600,000 5,000,000.0 11,800,000      
Aggregate number of shares of common stock reserved for future issuance       32,700,000    
Stock-based compensation, award term       10 years    
Performance-based stock options, outstanding       659,000    
Outstanding options and other stock based awards       15,092,000 16,306,000  
Number of shares available for future issuance       10,900,000    
2008 Equity Incentive Plan | Stock Options            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock-based compensation, vesting period       4 years    
2008 Equity Incentive Plan | Restricted Stock Units (RSUs)            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of unvested Restricted Stock Units       6,690,000 5,739,000  
Total fair value | $       $ 16.1 $ 6.8 $ 5.6
Weighted average grant-date fair value of awards granted | $ / shares [1]       $ 6.46    
2008 Equity Incentive Plan | Performance-based Stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Employee Stock Purchase Plan, authorized shares for issuance       500,000    
2008 Equity Incentive Plan | Performance-based Cash Awards            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock option plan granted on cash award | $       $ 1.0    
2008 Equity Incentive Plan | Minimum | Restricted Stock Units (RSUs)            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock-based compensation, vesting period       3 years    
2008 Equity Incentive Plan | Maximum | Restricted Stock Units (RSUs)            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock-based compensation, vesting period       4 years    
[1] Includes shares issuable under performance-based restricted stock unit awards.