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Stock Award Plans - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 12 Months Ended
Mar. 31, 2004
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
May. 23, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share reserve     700,000 700,000  
Share of common stock outstanding 1.00%        
Shares sold to employees   321,228 305,076 463,290  
Stock option grants vest exercisable rate   25.00%      
Vesting period   4 years      
Number of shares outstanding   19,779,229 21,541,664    
Stock based compensation expense related to stock award plans and the ESPP   $ 8,725 $ 48,622 $ 45,186  
Weighted average grant date fair value of the stock options granted   $ 2.56 $ 4.76 $ 3.26  
Total intrinsic value of options exercised   $ 6,200 $ 14,900 $ 3,100  
Cash received from the exercise of options   $ 3,300 $ 11,000 $ 2,300  
Weighted-average remaining contractual term   5 years 11 months 19 days 6 years 3 months 22 days 6 years 4 months 2 days  
Restricted stock units expected to vest   1,651,859      
Weighted average grant date fair value   $ 4.86      
Total intrinsic value of restricted stock units expected to vest   $ 2,400      
Total intrinsic value of restricted stock units vested   5,200 $ 62,700 $ 13,900  
Fair value of restricted stock units vested   $ 5,500 36,400 14,900  
Weighted average vesting period for unrecognized compensation cost   2 years 8 months 12 days      
Stock compensation expense   $ 8,725 $ 48,622 $ 45,186  
Employee Severance | Executive Officer          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock compensation expense   $ 1,600      
Tranche One          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Restricted stock vesting rate   25.00%      
Maximum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares reserved under ESPP 10.00%        
Options granted expiry term   10 years      
Consultant          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares outstanding   523,487      
Stock Options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period   36 months      
Unrecognized compensation cost related to non vested stock options   $ 4,900      
Restricted Stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period   4 years      
Restricted Stock Units (RSUs)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unrecognized compensation cost related to non vested stock options   $ 6,700      
Performance-based stock options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares outstanding   0      
2013 Equity Incentive Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Equity incentive plan, shares         21,500,000
Number of shares outstanding   8,026,762      
Employee Stock Purchase Plans          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares reserved for issuance 2,000,000 2,752,703      
Share reserve automatic increase each year 700,000