XML 102 R87.htm IDEA: XBRL DOCUMENT v3.3.1.900
Net Loss Per Share - Additional Information (Detail) - shares
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Stock Options [Member] | Unvested Restricted Stock [Member]      
Earnings Per Share [Line Items]      
Weighted average number of common shares excluded from computation of earning per share 2,269,141 1,531,110 1,373,119