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Stock-Based Compensation - Additional Information (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
Stock Options
Dec. 31, 2013
Restricted Stock Units (RSUs)
Dec. 31, 2012
Restricted Stock Units (RSUs)
Dec. 31, 2011
Restricted Stock Units (RSUs)
Dec. 31, 2013
Employee Stock Purchase Plan
Dec. 31, 2012
Employee Stock Purchase Plan
Dec. 31, 2011
Employee Stock Purchase Plan
Jun. 06, 2012
Employee Stock Purchase Plan
Dec. 31, 2013
Employee Stock Purchase Plan
Maximum
Dec. 31, 2013
2008 Equity Incentive Plan
Jun. 12, 2013
2008 Equity Incentive Plan
Jun. 06, 2012
2008 Equity Incentive Plan
Dec. 31, 2013
2008 Equity Incentive Plan
Stock Options
Dec. 31, 2013
2008 Equity Incentive Plan
Performance-based Stock or Cash Awards
Dec. 31, 2013
2008 Equity Incentive Plan
Maximum
Jun. 06, 2012
2008 Equity Incentive Plan
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                      
Employee Stock Purchase Plan, offering period                       27 months              
Employee Stock Purchase Plan, period for eligible employees to purchase                       6 months              
Employee Stock Purchase Plan, purchase price of common stock as percentage of fair market value               85.00%         100.00%            
Employee Stock Purchase Plan, authorized shares for issuance                   820,500             500,000    
Increase in shares of common stock authorized for issuance                     500,000     6,000,000 3,000,000        
Maximum number of shares of common stock authorized for issuance 112,500,000 112,500,000                 1,320,500               19,540,940
Number of shares available for future issuance               514,820         8,100,000            
Stock-based compensation, award term                                   10 years  
Stock-based compensation, vesting period                               4 years      
Stock option plan granted on cash award                                 $ 1.0    
Performance-based stock options, outstanding                         0            
Aggregate number of shares of common stock reserved for future issuance 18,600,000                                    
Outstanding options and other stock based awards 10,500,000                                    
Total intrinsic value of options exercised 0.6 0.3 0.2                                
Restricted stock units vesting Description         The restricted stock units generally vest in three annual installments from the date of grant and are generally issuable at the end of the three-year vesting term.                            
Fair value of restricted stock units which vested during the year         0.05 0.05 0.10                        
Stock-based compensation expense expected to be recognized       $ 5.9                              
Stock-based compensation, weighted average recognition period       2 years 6 months 22 days                              
Stock-based compensation, expected dividend yield 0.00%                                    
Weighted average grant-date fair value of stock options granted $ 2.03 $ 2.13 $ 1.37                                
Weighted average grant-date fair value of awards granted           $ 3.03   $ 1.18 $ 1.43 $ 0.68