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Summary of General Terms of Stock-Based Compensation Plans for Awards Granted (Detail) - $ / shares
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Granted awards   4,000
Options' exercise price   $ 2.90
2004 Plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Granted awards [1] 1,575,037  
Vesting schedule immediately upon granting to four years  
2004 Plan | Minimum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Options' exercise price $ 3.95  
2004 Plan | Maximum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Options' exercise price $ 12.75  
2006 Plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Granted awards [2] 256,716  
Vesting schedule immediately upon granting to four years  
2006 Plan | Minimum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Options' exercise price $ 3.85  
2006 Plan | Maximum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Options' exercise price 83  
2006 Plan | Restricted Stock Units (RSUs) | Minimum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
RSUs' grant date fair value 14.55  
2006 Plan | Restricted Stock Units (RSUs) | Maximum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
RSUs' grant date fair value $ 80.05  
2007 Plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Granted awards [3] 675,057  
Vesting schedule immediately upon granting to four years  
2007 Plan | Minimum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Options' exercise price $ 2.90  
2007 Plan | Maximum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Options' exercise price 90.85  
2007 Plan | Restricted Stock Units (RSUs) | Minimum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
RSUs' grant date fair value 12.35  
2007 Plan | Restricted Stock Units (RSUs) | Maximum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
RSUs' grant date fair value $ 76.75  
2008 Plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Granted awards 200,000  
Vesting schedule immediately upon granting to six years  
2008 Plan | Minimum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Options' exercise price $ 12.35  
2008 Plan | Maximum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Options' exercise price $ 21.20  
2009 Plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Granted awards [4] 500,000  
Vesting schedule immediately upon granting to four years  
2009 Plan | Minimum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Options' exercise price $ 4.775  
2009 Plan | Maximum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Options' exercise price $ 12.35  
2010 Plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Granted awards [5] 440,000  
Vesting schedule three years  
2010 Plan | Minimum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Options' exercise price $ 4.0505  
2010 Plan | Maximum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Options' exercise price $ 5.7  
[1] The granted awards, net of forfeited or canceled options, were within reserved shares of 1,400 thousand common shares.
[2] The granted awards, net of forfeited or canceled options or shares, were within reserved shares of 200 thousand common shares.
[3] The granted awards, net of forfeited or canceled options or shares, were within reserved shares of 400 thousand common shares.
[4] The granted awards, net of forfeited or canceled options, were within reserved shares of 300 thousand common shares.
[5] The granted awards, net of forfeited or canceled options, were within reserved shares of 200 thousand common shares.