Annual report pursuant to Section 13 and 15(d)

Net Loss Per Share - Additional Information (Detail)

v3.6.0.2
Net Loss Per Share - Additional Information (Detail)
shares in Millions
12 Months Ended
Dec. 31, 2016
class
shares
Dec. 31, 2015
shares
Dec. 31, 2014
shares
Earnings Per Share [Abstract]      
Total number of class of stock outstanding | class 2    
Common stock equivalents excluded from the calculation of net loss per share (shares) | shares 0.8 3.0 3.1