Quarterly report pursuant to Section 13 or 15(d)

Income Taxes - Additional Information (Details)

v3.10.0.1
Income Taxes - Additional Information (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Income Tax Disclosure [Abstract]        
Unrecognized tax benefits, interest or penalties recognized   $ 0 $ 0  
Corporate tax rate   21.00%   34.00%
Provisional net charge related to TCJA $ 7,578,000