Annual report pursuant to Section 13 and 15(d)

Property and Equipment, Net - Additional Information (Details)

v3.8.0.1
Property and Equipment, Net - Additional Information (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment [Abstract]    
Depreciation expense $ 369 $ 361