Quarterly report pursuant to Section 13 or 15(d)

Background and Basis of Presentation - Additional Information (Detail)

v3.8.0.1
Background and Basis of Presentation - Additional Information (Detail)
9 Months Ended
Sep. 30, 2017
Segment
Business Description And Basis Of Presentation [Line Items]  
Number of operating segments 1
Merger Agreement  
Business Description And Basis Of Presentation [Line Items]  
Exchange of shares, conversion ratio 1.3