XML 89 R45.htm IDEA: XBRL DOCUMENT v3.3.1.900
Fair Value of Financial Instruments - Additional Information (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Fair Value Disclosures [Abstract]    
Change in fair value of derivative liability recognized as other income (expenses), net $ 1.1 $ 0.7