Quarterly report pursuant to Section 13 or 15(d)

Stock Plans and Stock-Based Compensation - Additional Information (Detail)

v3.10.0.1
Stock Plans and Stock-Based Compensation - Additional Information (Detail) - 2013 Equity Incentive Plan [Member] - shares
6 Months Ended
Jun. 05, 2018
Jan. 01, 2018
Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Increase in shares reserved for issuance 1,500,000 2,220,439  
Shares available for grant     1,605,403
Employees, Directors and Consultant [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Options to purchase common stock granted     1,725,272