Quarterly report pursuant to Section 13 or 15(d)

Income Taxes - Additional Information (Details)

v3.8.0.1
Income Taxes - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Income Tax Disclosure [Abstract]      
Transition adjustment which reduced net deferred tax assets     $ 1.3
Federal statutory income tax rate 21.00% 35.00%