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Equity Incentive Plans - Additional Information (Detail) - shares
3 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Mar. 21, 2014
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Common stock, shares issued 29,422,247 29,420,247  
2009 Plan [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Common stock reserved for future issuance     0
2014 Plan [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Common stock reserved for future issuance 1,551,000    
Percentage of common stock issued and outstanding increase annually 4.50%    
Number of common stock shares subject to outstanding awards 4,614,000    
Employee Stock Purchase Plan [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Percentage of common stock issued and outstanding increase annually 1.00%    
Number of shares reserved 150,000    
Additional shares issued 300,000    
Common stock, shares issued 55,000