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Employee Savings Plan and Employee Stock Purchase Plan - Additional Information (Detail) - USD ($)
12 Months Ended
May. 05, 2015
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Defined Contribution Plan Disclosure [Line Items]        
401(k) eligibility minimum service period   90 days    
401(k) description of plan contributions   Contribution equal to 100% of the first 1% of salary deferrals and 50% of salary deferrals between 2% and 6%, up to a maximum matching contribution of 3.5% of salary each plan year for our employees.    
Employee vested percentage in salary deferrals and roll over contributions   100.00%    
Minimum period for vesting 100% contributions   2 years    
Minimum period for vesting of discretionary contributions   2 years    
Matching contribution amount   $ 2,400,000 $ 1,700,000 $ 1,200,000
Employee Stock Purchase Plan [Member]        
Defined Contribution Plan Disclosure [Line Items]        
Employees Company's common stock shares purchase limit percentage 10.00%      
Maximum number of shares that may be acquired by a participant   2,000    
Share of common stock purchase maximum   2,000,000    
Purchase of shares of common stock   44,034    
Compensation expense related to ESPP   $ 400,000 $ 0 $ 0
After Two Years Of Employment [Member]        
Defined Contribution Plan Disclosure [Line Items]        
Matching contributions, vesting percentage   100.00%    
One Hundred Percent Match For Percent Of Participants Contribution [Member]        
Defined Contribution Plan Disclosure [Line Items]        
Employer contribution percentage   100.00%    
Percentage of salary deferrals   1.00%    
50% Matching Contribution [Member]        
Defined Contribution Plan Disclosure [Line Items]        
Employer contribution percentage   50.00%    
Minimum [Member]        
Defined Contribution Plan Disclosure [Line Items]        
401(k) eligible age of employee   21 years    
Minimum [Member] | 50% Matching Contribution [Member]        
Defined Contribution Plan Disclosure [Line Items]        
Percentage of salary deferrals   2.00%    
Maximum [Member]        
Defined Contribution Plan Disclosure [Line Items]        
Percentage of salary deferrals   3.50%    
Maximum [Member] | Employee Stock Purchase Plan [Member]        
Defined Contribution Plan Disclosure [Line Items]        
Purchase price of common stock expressed as a percentage of its fair market value 85.00%      
Maximum [Member] | 50% Matching Contribution [Member]        
Defined Contribution Plan Disclosure [Line Items]        
Percentage of salary deferrals   6.00%