Annual report pursuant to Section 13 and 15(d)

Income Taxes - Schedule of Unrecognized Tax Benefit Roll-Forward (Details)

v3.8.0.1
Income Taxes - Schedule of Unrecognized Tax Benefit Roll-Forward (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
As of the beginning of the year $ 208 $ 193 $ 191
Increases for tax positions of current years 0 15 2
Reductions for tax positions of prior years (4) 0 0
As of the end of the year $ 204 $ 208 $ 193