Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies (Assets Recognized from the Costs to Obtain a Contract with a Customer) (Details)

v3.10.0.1
Summary of Significant Accounting Policies (Assets Recognized from the Costs to Obtain a Contract with a Customer) (Details)
Dec. 31, 2018
Minimum  
Capitalized Contract Cost [Line Items]  
Amortization period 2 years
Maximum  
Capitalized Contract Cost [Line Items]  
Amortization period 5 years