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Stock-Based Compensation - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jan. 01, 2016
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2015
Jan. 01, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Fair value of options granted   $ 13.53 $ 3.55 $ 12.41 $ 3.80    
ASU 2016-09 [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Cumulative-effect adjustment to stockholders' equity             $ 45
Nonemployee Consultants [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Weighted average fair values of outstanding options   $ 12.18 $ 2.82 $ 12.18 $ 2.82    
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 3,101,707           3,920,613
Options granted   90,000 112,000 838,500 722,000    
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] | Employees [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vesting period of awards granted 4 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