XML 45 R35.htm IDEA: XBRL DOCUMENT v3.8.0.1
Stock-Based Compensation - Additional Information (Detail) - USD ($)
$ in Millions
 1 Months Ended
Jan. 01, 2017
May 31, 2017
Employee Stock Purchase Plan    
Stock-Based Compensation    
Number of additional shares authorized for grant 400,000  
Stock issued during period, shares, employee stock purchase plans   100,000
Stock issued during period, value, employee stock purchase plans   $ 2.3
2016 Incentive Award Plan    
Stock-Based Compensation    
Number of additional shares authorized for grant 1,600,000