Annual report pursuant to Section 13 and 15(d)

Restructure - Additional Information (Detail)

v3.6.0.2
Restructure - Additional Information (Detail)
$ in Millions
1 Months Ended 12 Months Ended
Nov. 30, 2016
USD ($)
Position
Oct. 31, 2016
Position
Feb. 29, 2016
USD ($)
Employee
Dec. 31, 2016
USD ($)
Restructuring And Related Activities [Abstract]        
Reduction in workforce 5 14 11  
Percentage of workforce reduction   48.00% 27.00%  
Expenses on workforce reduction $ 0.7   $ 0.4 $ 1.1