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Stock-Based Compensation - Additional Information (Detail) - $ / shares
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Jan. 01, 2015
Dec. 31, 2014
Employees and Members of Board of Directors [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Fair value of options granted $ 6.41 $ 8.53 $ 6.32 $ 7.55    
Nonemployee Consultants [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Weighted average fair value of outstanding vested options $ 8.99 $ 13.75 $ 8.11 $ 14.61    
2014 Equity Incentive Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of stock options that may be granted after the tenth anniversary of the 2014 Plan     0      
Annual increases in number of shares reserved for issuance as a percentage of shares of capital stock outstanding through January 1, 2024     3.00%      
Share-based compensation arrangement by share-based payment award, number of shares authorized         2,284,061 1,600,000
Options granted 309,000 227,000 604,000 614,000    
2014 Equity Incentive Plan [Member] | Share-Based Compensation Award, Tranche One [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Percentage of vested shares on first anniversary of grant date     25.00%      
2014 Equity Incentive Plan [Member] | Share-based Compensation Award, Tranche Two [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting period of awards granted     36 months      
2014 Equity Incentive Plan [Member] | Maximum [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Term of awards granted     10 years      
2014 Equity Incentive Plan [Member] | Incentive Stock Options [Member] | Maximum [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share-based compensation arrangement by share-based payment award, number of shares authorized 30,000,000   30,000,000