Annual report pursuant to Section 13 and 15(d)

Income Taxes - Reconciliation of Federal Statutory Rate to the Effective Tax Rate (Details)

v3.8.0.1
Income Taxes - Reconciliation of Federal Statutory Rate to the Effective Tax Rate (Details)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]    
Federal income tax rate 34.00% 34.00%
Tax Reform - Change in enacted rate (22.20%)  
Foreign rate differential (1.20%) (2.90%)
State tax, net of federal benefit 2.40% 0.90%
Permanent items 0.00% (2.30%)
Other 1.80% (0.90%)
Withholding tax 0.00% (0.70%)
Change in valuation allowance (21.50%) (28.80%)
Effective income tax rate (6.70%) (0.70%)