Annual report pursuant to Section 13 and 15(d)

Intangible Assets - Additional Information (Detail)

v3.3.1.900
Intangible Assets - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Goodwill And Intangible Assets Disclosure [Abstract]      
Amortization expenses of intangible assets $ 1,640 $ 1,422 $ 1,521