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Stock-Based Compensation - Additional Information (Detail)
9 Months Ended
Sep. 30, 2016
USD ($)
Period
$ / shares
shares
Jan. 01, 2016
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Weighted average fair value of stock options granted to employees | $ / shares $ 1.50  
Options outstanding, Aggregate Intrinsic Value $ 0  
Options exercisable, Aggregate Intrinsic Value 0  
Excess tax benefit from stock-based awards $ 0  
The 2014 Plan [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of shares of common stock reserved for issuance | shares 1,527,770 338,930
Employee Stock Purchase Plan [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of shares of common stock reserved for issuance | shares 458,331 96,837
2014 Plan [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Common stock reserved for issuance, description Initially, a total of 1,527,770 shares of the Company’s common stock were reserved for issuance pursuant to the 2014 Plan, which number is also the limit on shares of common stock available for awards of incentive stock options. Commencing on January 1, 2016 and ending on (and including) January 1, 2024, the number of shares available for issuance under the 2014 Plan will, unless otherwise determined by the Company’s Board of Directors or the Compensation Committee, be automatically increased on January 1st of each year in an amount equal to 3.5% of the total number of shares of the Company’s common stock outstanding on December 31st of the preceding calendar year.  
Percentage of common stock outstanding to increase shares reserved for issuance 3.50%  
ESPP [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Common stock reserved for issuance, description The number of shares available for issuance under the ESPP will, unless otherwise determined by the Company?s Board of Directors or the Compensation Committee, be automatically increased on January?1st of each year in an amount equal to 1% of the total number of shares of the Company?s common stock outstanding on December?31st of the preceding calendar year.  
Percentage of common stock outstanding to increase shares reserved for issuance 1.00%  
Duration of employee stock purchase plan as determined by the compensation committee 24 months  
Duration for offering period, employee stock purchase plan 6 months  
Employee stock purchase plan, number of purchase periods | Period 4  
Maximum duration for purchase under employee stock purchase plan 1 year  
Maximum duration of employee stock purchase plan 27 months  
Percentage of purchase of common stock 85.00%  
Percentage of common stock on the date of purchase 85.00%