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Stock Compensation Plans - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expiration period from grant date 10 years    
Weighted-average grant date fair value of stock options granted (usd per share) $ 3.48 $ 6.04  
Employee      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation cost related to unvested employee stock option awards $ 7,200    
Remaining weighted-average vesting period 1 year 11 months 12 days    
Non-Employees      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation cost related to unvested employee stock option awards $ 184    
Remaining weighted-average vesting period 2 years 1 month 2 days    
2014 Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares of common stock for annual increase in shares available for issuance 1,200,000    
Percentage of outstanding shares of common stock for annual increase in shares available for issuance 3.00%    
Shares available for grant 146,268    
2014 and 2012 Plans | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Option vesting under Equity Incentive Plans, high term 1 year    
2014 and 2012 Plans | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Option vesting under Equity Incentive Plans, high term 4 years    
2012 Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares repurchased 0    
Accounting Standards Update 2016-09 | Additional Paid-in Capital      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Cumulative effect of new accounting principle     $ 50